Application Techniques for Gray & White Caulking

Gray and white caulking for boat decks is growing in popularity, and we address the additional considerations for the installation and maintenance of these products, as compared to black caulking.

Teakdecking Systems SIS 440 Teak Deck Caulking in white and gray offer the same performance results as black caulking. However, different pigmentation formulas for these light colors make it necessary to adapt procedures for installation, cure time, sanding, and general maintenance. The light-colored caulk is not as “forgiving” as black caulk and requires more care from technicians during installation, as well as more maintenance during use.

NOTE: Throughout this article, special comments related to gray and white caulking are in bold.

IMPORTANT: The following information is supplemental and does not replace the SIS 440 instructions on the cartridge or foil “sausage” packaging. Read and follow all packaging instructions.

Gray & White Caulking Guidelines

Be sure to work under a cover when possible. Otherwise, only open the length of seams that can be cleaned and re-caulked on the same day.

PREPARATION FOR NEW SEAMS

Proper Seam Preparation is Critical for Caulk Adhesion

1) Sand the open seam. Perform the sanding with a TDS Seam Sander or a similar tool to prep the wood for effective caulk bonding. This step will fair the wood surface, and it will remove the smoothness created by saw “polishing.” The goal is to create a fresh wood surface.

2) Clean & De-Oil. After the wood is prepped by sanding, use a vacuum or air blower to remove sawdust or other contaminants. Teak is naturally oily, so it must be de-oiled for strong bonding to caulk. Perform this by carefully cleaning with acetone saturated lint-free clean cotton rags. Not only does this step remove oil, but it also removes any remaining contaminants in the seams.

Remaining contaminants may show in the cured white and gray marine caulking but are not as noticeable in black caulk. 


Seam is under-filled with contaminants in the caulk

PREPARATION FOR RE-SEAMING

Fully remove old residue for proper adhesion of caulk. Accomplish this most effectively with a seam saw or router. ATTENTION: Expose fresh wood on butt joints by cutting them or scratching the wood surface with a reefing hook. These joints are most susceptible to inadequate prep and caulk filling.

Note for Bedding Compounds:

Residue may be present on a new deck if installed on bedding material. Remove all this residue and follow steps 1 and 2 for “new seams” (above).

Seam Prep: After removing all residue from the new or re-seamed deck, continue with the same instructions for new seams: sand, clean, and de-oil before beginning to fill seams with caulking. Failure to take these steps may cause seam failure.

IMPORTANT: Seam Moisture Content must be 12% or less in surrounding wood. Do not caulk wet seams. This requirement is often overlooked and will cause seam failure. Initial bonding may be achieved, but as the wood dries it will stretch the caulking and the weakest bonds will break. Flexible one-component bedding compounds exacerbate this condition.

CAUTION: Do not use wood primers intended for other caulk products. This will prevent adhesion of the TDS product, void the product warranty, and may cause staining within the cured caulking.


FILLING THE SEAMS WITH GRAY AND WHITE CAULKING

1) Nozzle Prep. To facilitate filling, cut the tip of the nozzle on an angle, puncture foil seal, then squeeze tip with pliers so nozzle fits into the seam.

2) Filling Seams. Fill from the bottom up and slightly overfill. Then spoon to press caulk into seams. Caulk should be proud of the deck surface by 1 to 2 mm after spooning. Let the caulking cure. If caulking cures below the level of the deck surface it may trap contaminants within the caulk. NOTE: Make sure butt joints are completely filled and void-free; this intersection is most susceptible to improper filling and bonding.


Inadequately filled seams

CURE TIME AND SANDING FOR GRAY AND WHITE CAULKING

Cure time is a function of (1) cross-sectional dimensions of the seam and (2) ambient temperature and humidity of the work area. Conditions of cold or very dry air lengthen cure time. Generally, the caulking cures from the top down at a rate of about 1 to 2 millimeters per day. A seam of ¼” (6.4mm) in normal conditions (~74°F/23°C at 50% relative humidity) will be ready for sanding in 8 to 12 days. For large seams (¼”-¾” or 6.4-19.2mm) or in colder, dryer conditions, allow curing for a minimum of 12 days.

Remember: Deeper seams require more curing time.

When using white and gray marine caulking, allow additional curing time if the situation permits.


Shrinking and separation

If caulking is not fully cured and prematurely sanded, then shrinkage, deformation, and ‘dragging’ or wrinkling of the caulk surface may occur. This action may also cause premature seam failure. Uncured caulking will absorb the sanding dust as well as other contaminants, causing discoloration and potential compromising of the seam. 


If excess caulking is cut away, wait one day before sanding. Freshly cut caulking needs to “oxidize” with outside air so the surface toughens. This helps to create a smooth surface and will be easier to clean. This is especially beneficial for white and gray caulk seams.



When sanding white and gray caulk seams, it is helpful to start with 80 grit and then ‘finish sand’ with 100 or 120 grit sandpaper. This ‘fine sanding’ helps to smooth the caulk and will assist in preventing contaminants from accumulating in the small crevices. 


A split seam is another problem with inadequate curing time. When panels (with uncured caulk) are moved before installation, the boards often flex causing a split in the seam’s center.

After-Care Suggestions for Gray & White Caulking

MAINTENANCE

Light-colored deck caulking is similar to other light-colored accessories such as boat cushions and upholstery. Thereforedirt and contaminants will show more and require more maintenance.


Soiled White Caulk (Look at upper right corner where sunlight illuminates the white color.)

Caulk is a flexible material and seams may raise and lower depending upon the moisture content of the teak. If seams remain high (relative to deck surface level) for more than six months, it may be necessary to sand or cut the seams to plank level. Further, walking on proud seams creates pressure and may cause damage too.

Evaluate the deck periodically and lightly sand to maintain a good appearance and extend its life. Do not power-wash teak decks.

CLEANING

1) NORMAL CLEANING

Use TDS ECO-100 (Powder) and ECO-300 (Liquid) Teak Cleaners, designed to be used as often as desired. They are both U.S. Clean Marina and MARPOL compliant for safe discharge into any waterway or marina. When possible, use these cleaners with medium grit scrubbing pads (e.g., Scotchbrite-type “red” medium grit). These are very effective and will help to smooth the deck.


Regular scrubbing across the grain is sufficient between sanding

Clean problematic stains such as diesel, wine, fish blood, etc. immediately with the ECO-100 or ECO-300 Teak Cleaners. If this is not possible, then spot cleaners such as K2R Marine Cleaner and Dawn dish soap can be effective. 

Beautiful clean decks (teak is still wet)

2) Stubborn Stains 

A light sanding of the seam with 80 grit sandpaper may remove the stain(s). In order to achieve best results, finish the seam with 100 or 120 grit sandpaper to ensure a smoother finish on the caulk surface.

Teak releases oil naturally, therefore discoloring white and gray caulkThis teak oil is most prominent on new decks and fortunatelyit diminishes as the teak ages. In addition, other oils, sealers, and coatings are likely to show more against light-colored caulk too. Dirt, soot, or oily stains left on a deck for an extended time may leach into the caulking and cause staining and discoloration. Note: Varnish will NOT adhere properly to SIS 440 Teak Deck Caulking.

REPAIR

For particularly stubborn stains that are not removable or for gouged/damaged caulk, a repair is easy to make. Cut out a small amount of caulk in a “V” shape and wipe with a clean lint-free rag soaked in acetone. Then, tape and re-caulk the area with SIS 440 Teak Deck Caulking. It will adhere strongly to the old SIS 440 Teak Deck Caulking, making it impossible to separate the old and new caulk areas once cured. In order to help blend the color, lightly sand the repaired area after curing, or wait. Eventually, repairs will be almost impossible to see.


Beautiful white caulk



Gray and white caulking create a beautiful, more contemporary decking style. For long-lasting quality, follow proper installation guidelines as addressed above. Contact us with your questions. We are pleased to share the information that we have learned in the last 38 years.

RESOURCES

“SuperyachtNews Teak Decks: grey caulking vs black caulking” – July 19, 2018

“Maintaining grey and white caulking on deck” – November 1, 2018

Teakdecking Systems articles about caulking

How to Inspect Teak Deck Caulking and Seams

How to Recaulk Seams

What is the Caulk Yield for Teak Deck Caulking

Read our 16-page Caulking Application Guide for expert tips on marine caulking too.

We are available to answer your questions to ensure the success of your project, so please call or email.

CONTACT US

941-756-0600 – Press “1” for “Products”

products@teakdecking.com


ALL PRODUCTS

By Anella Alcott April 11, 2025
If you're planning to get a new deck on your boat, and you've chosen teak, a composite deck, or a cork alternative, this guide will walk you through the full process, from digitization and manufacturing to final installation so you’ll know exactly what to expect from start to finish. TEAK DECKS Digital Templating The first stage involves one of our technicians digitially templating the area using the latest in precise measuring technology. Our team digititally templates vessels all around the world. Engineering Our experienced designers are masters of creating beautiful and technically precise decks using CAD construction program, importing data provided by our digital templating team. Our designers’ exceptional ability to create visual symmetry ensures impeccable finishes and beautiful aesthetic decks. Manufacturing TDS panels are manufactured in our factory utilizing jigs that are adjusted to conform to the vessel’s shape. Teak planks of the required thickness and width are carefully hand inspected, scrutinizing each plank for grain orientation, mineral deposits, or imperfections such as a small knot. The planks are placed into the jig in such a way that the finished deck will have a uniform butt joint pattern. Creating a Watertight Barrier A phenolic or fiberglass backing is securely vacuum bonded to the teak, using our own epoxies that guarantee durability, flexibility, strength and reliability. The exceptional bonding strength, ensures your deck stands the test of time. After the epoxy cures, the newly formed panels are removed from the jig, and the seams between the planks undergo routing, cleaning, and caulking. Margin Trim Once the caulking is cured, the final step involves laying out the teak deck and laying all the margin trim. Upon completion, the finished deck undergoes a thorough quality inspection, ensuring it aligns precisely with the template. Transport & Installation The finished deck panels are placed in custom-made crates and then shipped and installed worldwide. Prior to the arrival of the new deck, the old deck is removed. Our installers inspect for any issues such as water intrusion, delamination, or corrosion on the vessel’s surface. If such issues are found, the areas are repaired before the new deck is installed. Caulking & Sanding Once the deck has been bonded to the vessel, it is time to caulk using our own proprietary, UV, and chemical-resistant caulking TDS SIS-440. After curing, the deck is then ready to be sanded. The entire deck is sanded with 36 grit to remove excess caulking, followed by 60 and 80 grit to enhance the look of the deck. COMPOSITE DECKS Digital Templating The first stage involves one of our technicians digitially templating the area using the latest in precise measuring technology. Our team digititally templates vessels all around the world. Engineering Our experienced designers are masters of creating beautiful and technically precise decks using CAD construction program, importing data provided by our digital templating team. Our designers’ exceptional ability to create visual symmetry ensures impeccable finishes and beautiful aesthetic decks. Manufacturing Every composite decking panel is custom made to perfectly fit the areas to be covered. The panels are delivered with completed seam pattern, sanded and ready to be glued down on most structural surfaces. In the case of SeaSole, the deck is installed using the “peel and stick system”. We use a combination of our TDS bedding and bonding adhesive, along with TDS two-part, flexible epoxy fitting glue, to secure the panels in place. The caulking in the seams is our TDS proprietary patented filler, an enduringly elastic, solid rubber polyurethane joint sealant. Our team will first carry out an inspection of the boat to identify the best application method for each area. Quality Control Once the caulking is cured, the final step involves laying out the composite deck and building all the margin trim. Upon completion, the finished deck undergoes a thorough quality inspection, ensuring it aligns precisely with the original template. Installation The finished deck panels are placed in custom-made crates and then shipped and installed worldwide. Prior to the arrival of the new deck, the old deck is removed. Our installers inspect for any issues such as water intrusion, delamination, or corrosion on the vessel’s surface. If such issues are found, the areas are repaired before the new deck is installed. C ORK DECKS Digital Templating The first stage involves one of our technicians digitially templating the area using the latest in precise measuring technology. Our team digititally templates vessels all around the world. Engineering Our experienced designers are masters of creating beautiful and technically precise decks using CAD construction program, importing data provided by our digitizing team. Our designers’ exceptional ability to create visual symmetry ensures impeccable finishes and beautiful aesthetic decks. Manufacturing Every cork decking panel is custom made to perfectly fit the areas to be covered. The panels are delivered with completed seam pattern, and ready to be glued down on most structural surfaces. Our team will first carry out an inspection of the boat to identify the best application method for each area. Creating a Watertight Barrier After the adhesive cures, the seams between the planks undergo routing, cleaning, and caulking. Installation The finished deck panels are placed in custom-made crates and then shipped and installed worldwide. Prior to the arrival of the new deck, the old deck is removed. Our installers inspect for any issues such as water intrusion, delamination, or corrosion on the vessel’s surface. If such issues are found, the areas are repaired before the new deck is installed. We use a combination of our TDS bedding and bonding adhesive, along with TDS two-part, flexible epoxy fitting glue, to secure the panels in place.
March 28, 2025
Everything you need to know about cork decks As the industry and yacht owners move towards sustainable decking options, we have recently begun working with cork. This decision has been driven by the increasing demand from environmentally conscious customers . As more people prioritize eco-friendly choices in their purchases, cork has emerged as an ideal decking material. Known for its sustainability and numerous environmental benefits, cork offers unique characteristics that not only provide practical advantages but also contribute to a reduced environmental footprint . This makes cork a compelling choice for those looking to make greener decisions. TDS is a distributor for Navicork by Amorim , the world leader in the cork industry , which is leading the marine revolution with cork decks that champion sustainability. With more than 150 years of history, Amorim has made an unparalleled investment in research, innovation, and design, developing a portfolio of products and solutions that set the standard for environmentally responsible decking . Why is cork so environmentally friendly? UNESCO recognizes cork oak forests as one of the 36 most crucial ecosystems globally, highlighting their environmental significance. Cork is one of the most sustainable resources in the world and remains the only truly carbon-negative product on the market. Eco-Friendly & Carbon-Negative One tonne of cork absorbs about two tonnes of CO₂ while producing only 1.6 tonnes during processing. Harvesting cork does not require felling the tree , allowing forests to continue absorbing carbon dioxide. The bark regenerates , ensuring a sustainable and renewable material for generations to come. Lightweight and Durable Cork is significantly lighter than traditional decking materials, 2 to 5 times lighter than teak, reducing overall vessel weight and fuel efficiency. It is highly resistant to wear and tear , making it suitable for high-traffic marine applications. Superior Thermal and Acoustic Insulation Low thermal conductivity (0.065 W/mºK) minimizes condensation, reduces energy loss and keeps decks cool underfoot. The closed-cell structure of cork dampens structural noise , reducing onboard sound levels and acoustic performance. Comfort & Safety Cork’s soft, velvety texture provides superior underfoot comfort , reducing fatigue during long periods on deck. Its natural non-slip properties enhance safety, making it an excellent choice for marine environments. It’s splinter-free and reduces impact injuries compared to traditional hardwood decks. Design Flexibility & Aesthetic Appeal Available in various textures, colors, and patterns, cork decking can be customized to match the design vision of any vessel. Offers a unique aesthetic while still delivering the premium look and feel desired. For more information check our cork decking section
March 11, 2025
What to expect from TDS when you order a deck Once you have decided to order your new deck from us, we have a process in place to ensure that the whole manufacturing and installation goes as smoothly as possible. With a commitment to transparency and customer satisfaction, we have put together some guidelines outlining the most important key steps from the moment that you commit to a new deck from us. 1. Customer Inquiry, Quotation Process and Formal Quote When we are first contacted by a customer, we ask that they send us photos and a layout of the boat via our contact page on our website so that we can understand their specific requirements. Our team then conducts its own research by reviewing the layout and photos provided, as well as gathering information about your boat. Based on this information, we develop a budgetary quote, and if the customer is satisfied with it, we provide a formal quote. The formal quote outlines all the essential details, including design specifications, materials, price and timelines. It is crucial that you read through this document carefully. Taking the time to review it not only helps you understand what to expect but also gives you an opportunity to ask questions or clarify any uncertainties before signing. Once the quote is acceepted, we issue a pro forma invoice for the templating/digitizing, after which we will organize a date to digitize the deck. Once we have the digital file, our sales and project management teams meet to review both the quote and the digitized layout to ensure that the quoted square footage is accurate. Should there be any discrepancies, we adjust the quote accordingly and will call you to explain the changes. 2. Securing Your Order with a Deposit After both parties agree on the final numbers, we send an order confirmation for your signature and will then send an invoice for 50% of the materials cost and the cost of digitization so that we can begin building the deck. Once the funds are received, we start production, later invoicing for the remaining 50%. Travel costs associated with the digitization are invoiced separately after the activity has concluded. 3. Project Management and Timeline Confirmation We will assigns a dedicated Project Manager to your deck, and they will be your primary point of contact throughout the entire process. Your Project Manager is responsible for confirming the production and installation timeline and ensuring that every phase of the project is scheduled appropriately. They will communicate any updates, answer your questions, and address any concerns that may arise during production. 4. Final Payment and Scheduling Shipment Before the deck is shipped and installed, we require that the full remaining balance is settled and we can then schedule shipment and installation without any delays. 5. Installation You will have received an estimated quote for installation. Once the deck is installed we ask the captain or project manager to walk the deck with our team and get a sign off and release for the deck and then we invoice them for the final amount along with any associated travel, travel time, accommodation and subsistence. We will invoice you the final amount once the installation has been done.
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