When gelcoat turns chalky and badly oxidized, it takes real cutting power to bring it back. Sea-Shield® Heavy Cut #1 is the first step in restoring severely damaged gelcoat, removing heavy oxidation, scratches, chalk residue, and 1500-grit sandpaper marks from both painted and unpainted surfaces.
Used by professionals, the compound breaks down evenly for a uniform finish. It works best with a circular polisher at 1000 to 1500 RPM and a Sea-Shield® White Cut & Polish Pad, and Sea-Shield® Buffing Lube® can be added for very dry gelcoat.
Pick the 4oz. bottle to test it on one section first. The 16oz. bottle is sized for owners taking on their own restoration, and the 1gal. size is the professional choice for full hulls and multiple boats. Case packs in every size keep marinas, dealers, and boatyards stocked for the season.
Shop by size:
Sea-Shield® Heavy Cut #1 (4oz.)
Sea-Shield® Heavy Cut #1 (16oz.)
Sea-Shield® Heavy Cut #1 (1gal.)
Sea-Shield® Heavy Cut #1 (4oz., Pkg./12)
Sea-Shield® Heavy Cut #1 (16oz., Pkg./12)
Sea-Shield® Heavy Cut #1 (1gal., Pkg./4)
Continue the restoration: follow with Sea-Shield® Cut & Polish #2 to restore gloss, then refine with Sea-Shield® Medium Compound and Sea-Shield® Final Polish. Keep Sea-Shield® Buffing Lube on hand for very dry gelcoat.
Frequently asked questions
1. What does Sea-Shield® Heavy Cut #1 remove?
It removes heavy oxidation, scratches, and chalk residue, along with 1500-grit sandpaper marks.
2. What surfaces can I use Sea-Shield® Heavy Cut #1 on?
It is designed for both painted and unpainted gelcoat surfaces, and it is used by professionals to restore severely damaged gelcoat to its original gloss.
3. How do I apply Sea-Shield® Heavy Cut #1?
Use a circular polisher at 1000 to 1500 RPM with a Sea-Shield® White Cut & Polish Pad. Work a 2-foot by 2-foot area with medium pressure, moving slowly back and forth and keeping the pad flat. Spur the pad, rebuff with light pressure until most of the residue is gone, then wipe off the rest with a clean microfiber towel. Add Sea-Shield® Buffing Lube® as needed.
4. What should I use after Sea-Shield® Heavy Cut #1?
Follow with Sea-Shield® Cut & Polish #2 to restore gloss.
Sea-Shield offers aftercare products, buffing pads, compound, polish, synthetic wax, and ceramic coating products, as well as application services in conjunction with our advanced surface restoration training for the mega-yacht and boating industry. Your first port of call for boat protection. Francisco and the team put skill, time and effort into every job – they are passionate about providing a truly first-class service; so you know your vessel will be handled with the utmost care and precision. Our years serving in international marine crews go hand in hand with Sea-Shield's Trademarked range of Professional Ceramic surface treatments. When properly applied, these will restore your vessel's original paint to like-new – affording owners both protection and peace of mind.
Nano-Technology: Sea-Shield's product range uses state-of-the-art Ceramic Coating based on Nanotechnology and includes effective treatments for glass, metal, paint, plastic, gelcoat and other surfaces. These will provide your boat with a super-durable and effective protective layer in the most adverse marine conditions.
Global business: Through our global partnerships, Sea-Shield has become the provider of choice for discerning mega yacht owners and professional crew members all over the world – giving us the gold-seal endorsement of thousands of satisfied customers.
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Sea-Shield offers a unique opportunity to provide our marine surface care products for the consumers and detailing specialists in your local area.Being surface care specialists, we have the to select products based on customer and partner feedback and are able to prove the results on boats that we work on ourselves.
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still need more bite than the Sea Shield Yellow Wool Pad provides. Additionally the White Wool Pad can be used as a finishing pad in lieu of the Yellow Pad providing better clarity on certain types of gelcoat and paint
Boat Ceramic Coating: Step-by-Step Guide Using Sea-Shield Products
A boat needs the right care to stay in good shape. Salt wears it down. The sun does too. Water spots form. Surfaces fade. A ceramic coating helps with all of this. It acts as a barrier between your boat and the elements.
Sea-Shield makes products for marine surfaces. They protect against oxidation and UV rays. They help prevent water spots and stains. The coating lasts, the gloss holds up, and maintenance gets easier.
This guide walks through applying ceramic coating using Sea-Shield products. Each step matters. Follow them in order and you'll get protection that lasts.
Step 1: Wash and Decontaminate
You need a clean surface. Really clean. Salt sits on the surface after every trip. Dirt builds up. Old wax leaves residues. All of it has to go before you coat anything.
Use Sea-Shield Boat Soap for this. It works on gelcoat, paint, metal, and plastic. The formula is hyper-concentrated and creates volumes of suds that rinse away in seconds without leaving a film. It won't strip even the most delicate waxes and instantly restores the high gloss shine. Pour a quarter-sized drop into a 5-gallon bucket and fill with 3-4 gallons of water.
Water spots show up on boats. Minerals from hard water or salt leave marks. If you see them, use Sea-Shield Rust Stain Remover. It dissolves calcium deposits, salt, and other contaminants. The unique spray-gel formula allows working on vertical surfaces and hard-to-reach areas easily. Spray the product directly on the surface, let it work for 1-5 minutes, then rinse with fresh water. Do this before you polish. Otherwise, you'll just polish over the spots.
Step 2: Surface Correction and Polishing
Your surface might look clean now, but it's not ready yet. Paint oxidizes. Gelcoat gets dull. Swirl marks form from washing over time. A coating won't hide these problems. It will seal them in.
Polish first. Sea-Shield uses a three-step compound and polish system for optimal results. The level of correction depends on your boat's condition.
For heavy oxidation and scratches, start with Sea-Shield Heavy Cut #1. This compound removes heavy oxidation, moderate scratches, heavy chalk residues, and even 1000-grit sandpaper marks from both painted and gel coat surfaces. Best results are achieved using a circular polisher (1200-1800 RPM) equipped with a compound wool buffing pad #1. Work in areas no larger than 3'x5', moving the machine slowly back and forth while keeping the pad flat on the surface.
Next, use Sea-Shield Cut and Polish #2. This product removes 1500 grit sandpaper haze, light scratches, light oxidation, and chalk from both paint and gel coat. It also removes heavy compound marks left from the first step. The formula is very lubricated, which prevents burning the surface. Apply using a circular polisher (1200-1800 RPM) with a compound wool buffing pad #2.
For the final polish, use Sea-Shield Swirl Remover #3. This polish removes light oxidation, fine scratches, light chalk, and swirl marks while bringing back the ultimate luster. The extremely lubricated formula completely erases swirl marks and creates a swirl-free finish. Use a circular polisher (1200-1800 RPM) equipped with a Sea-Shield polishing buffing pad #3.
Note: If your boat is newer or has only light oxidation, you can skip Heavy Cut #1 and start with Cut and Polish #2, or even just use Swirl Remover #3.
After polishing, the surface must be completely clean before coating. Use Sea-Shield Prep Spray for this. This integral step removes polishing oils left behind from compounding and polishing. The proprietary primer agent increases the integrity of the molecular bond that occurs when applying a ceramic coating, with no residual film left behind. Prep Spray also works well as a glass and stainless cleaner.
Step 3: Applying the Ceramic Coating
Now you coat. This is the main protection layer. Sea-Shield offers two professional-grade ceramic coating options.
Sea-Shield Crew is a professional, yacht-quality marine clear coat designed for DIY applications and crew use. Available in 50 ml, 100 ml, and 500 ml sizes, Crew provides long-lasting protection that can last 1-2 years or more with regular care and washing. It protects against UV radiation, rust, oxidation, and environmental pollutants.
Sea-Shield Professional is designed specifically for professionals looking to have the best protection. Available in 15 ml, 50 ml, and 500 ml sizes, Professional provides exceptional protection against rust, fading, and degeneration. The coating uses advanced ceramic nanotechnology to produce outstanding results.
Both coatings can be applied to a variety of surfaces, including paint, gelcoat, fibreglass, aluminium, and metal.
Application Instructions:
The application area should be well-ventilated with good lighting. Avoid direct sun or hot surfaces when applying. Hot surfaces cause the coating to flash too fast and you won't level it properly. Work in shade or when the surface is cool.
Apply the coating when the surface is completely dry, working on small sections at a time. Wrap a microfiber suede around an applicator block. Drip the product along the length of the applicator block. Apply in a cross-hatch pattern—horizontal and vertical strokes—for even coverage.
Let the coating flash. Flash time depends on temperature. In warm weather (over 70°F), buff off the coating in about 15 seconds. In cooler weather, you can wait up to 2 minutes before buffing. Use one microfiber towel to wipe away extra coating, then use a second towel to polish the surface until it has a clean, glossy shine. Be sure to remove all excess product, as any spots you miss might leave streaks or an uneven finish.
Use a different side of the applicator as it hardens or if it gets dirty. Keep working in small areas to maintain even coverage.
Complete Kits Available: Sea-Shield offers ceramic coating kits that include the ceramic coating, prep spray, applicator blocks, and microfibre towels. These Starter, Intermediate, and Advanced packs provide everything needed for application.
Step 4: Curing and Initial Care
Curing takes time. You can't rush it. The coating needs to harden and reach full strength before it can do its job.
The surface should be kept dry for at least one hour. The coating is dry to touch in about 1 hour. The product is waterproof and will fully cure and harden after 48 hours. For maximum hardness, allow up to 5 days.
Keep the boat dry during the curing period. No washing. No rain if you can help it. Water exposure during curing weakens the bond. If light dust lands on the surface, wipe it off with a soft microfibre towel. Be gentle.
For extra protection, you can apply a second layer of ceramic coating after waiting for at least one hour between coats.
Once the coating cures, the surface changes. It becomes slick. The gloss deepens. Salt doesn't build up as fast. Stains don't stick. Oxidation slows down. You'll notice the difference when you touch it.
Step 5: Maintenance and Regular Care
A coating isn't permanent. It lasts a long time, but it needs care. Regular maintenance keeps it working and looking good.
Use Sea-Shield Boat Soap for washing. It's gentle enough that it won't remove wax or strip the ceramic coating. The biodegradable formula safely cleans all surfaces including paint, gelcoat, glass, and plastic. For coated surfaces or for refreshing Sea-Shield coatings, add 4 ounces of Sea-Shield Nano Fresh to a 5-gallon bucket.
After washing, you can boost the coating. Sea-Shield Final Shield works for this. Final Shield is a ceramic spray top coat that's the most versatile and easy-to-use protection you can apply. The silica resin formula creates a wet and shiny finish on almost all surfaces, including paint, gelcoat, metals, vinyl, leather, black trim, and acrylic. Spray the product on a microfibre applicator (not directly on the surface), apply a very thin coat, and wipe thoroughly until only a light film remains.
