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3M™ Wetordry™ Sandpaper
Don't Forget This Important Step! 

We recommend sanding your plugs, molds, and finished parts. Time spent on each of these stages will pay dividends in the longevity and quality of all parts. First, be sure your plug has a perfect surface prior to making a mold. Then wet sand new molds to achieve a perfect surface before polishing. Finally, finish sand your part to give it the deepest shine and a perfect finish.

Your carbon fiber parts will have much greater depth if the surface is perfectly level, smooth, and finished. Using consecutively finer grades of sandpaper from 240-600, any orange peel, texture from PVA, or other imperfections in the mold surface or finished part can easily be removed.

You can also use these sheets for leveling of external gel coat repairs. Each combination package includes 240, 320, 400, 500, 600 grit. 
Duratec Gray Surfacing Primer
Easy Sanding, High Build Primer Perfect for Plug Finishing

Duratec® Surfacing Primer is the best choice for coating your plug or reconditioning your mold. It is suitable for use with wood, MDF, tooling board, composite plugs, patterns and models. The unique air-cure technology allows fast cure even with thin coats, it will even bond to epoxy laminates. This surface primer can be applied as heavily as 45 mils to fill fabric pores on plugs or over repairs. To reach your desired spray viscosity, you can thin 5%-15% with #2306 Duratec Thinner if necessary. Duratec Surfacing Primer offers a high heat distortion temperature and minimal shrinkage. By minimizing shrinkage, repairs are easily hidden. The gray primer sands easily and can be polished to a Class 'A' mirror finish.
Requires 2% MEKP.
Duratec Clear Hi-Gloss Gel Coat Additive
Spray Gel Coat Like Paint

Duratec® Clear High Gloss Additive can be mixed in a 1:1 ratio with regular gel coat to reduce viscosity and porosity, improve gloss level, and permit a complete open-air cure. It can also be blended with a 15% ratio to tooling gel coats to upgrade mold surfaces, improve gloss retention, increase impact resistance, and reduce heat distortion.

The reduction in viscosity allows gel coats to be sprayed controllably through siphon and HVLP equipment, reducing sanding and polishing time. When used for repairs, this product will result in a low porosity surface.

When making below-the-waterline repairs on boats, for example, we recommend adding our #71 Styrene Wax to maximize hardness.

Requires 2% MEKP.

Duratec Clear Hi-Gloss Gel Coat Additive

Get a superior finish, add quality, and save time and labor for your composite parts. Blend #1040-B Hi-Gloss Additive with gel coats for repairs, or upgrade the surface of molds or parts. Here's why:

1) Low Porosity – When used for repairs, blending the additive with gel coat produces a low porosity surface.

2) Reduce Orange Peel - The low viscosity of the blend results in a smooth finish that is easily sanded.

3) Improved Properties - For mold surfaces, the blending of the additive with tooling gel coat creates a higher heat distortion temperature, improved gloss retention, increased impact resistance, and reduced subsurface porosity.

4) Superior Finish – When blended one-to-one with gel coats, the additive creates an air cure, enamel-like coating. No air-dry additive is required. When used for gel coat repair, surfaces are restored to like-new condition.


Product Properties
Viscosity - As measured on a Brookfield Viscometer Model RVF, Spindle #2 at 2.0 rpm. 110 CPS
Thixotropic Index 1
Gel Time - Sample based on a 100 g mass, catalyzed at 2 percent with MEKP 16-20 min.
Weight per Gallon 8.0 lbs
Volatile Organic Compounds 198 g/l


Surface and Product Preparation

Starting from a correctly shaped and dimensionally stable plug, sand the entire surface with a coarse sandpaper (80-120 grit), making sure to feather in puttied and filled areas. Wipe the sanded surface with a fast solvent and a clean white cloth or paper towel. Do not use a tack rag.

Thoroughly stir Duratec Polyester Surfacing Primer in the can prior to catalyzing. Due to the rapid gel time of the primer, mix only the amount that can be applied within 16 to 18 minutes. (Higher temperatures yield a shorter pot life and gel time, while lower temperatures yield a longer pot life and gel time). Catalyze at 2% with MEKP catalyst. If necessary, thin 10 to 30% with a fast acrylic lacquer thinner after catalyzation to achieve a desired spray viscosity .

Application Conditions

The surface should be clean, dry, and free from oil, grease, wax, or other contaminants. Ambient temperature should be in excess of 60°F, or 16°C to ensure a rapid and complete cure. Time calculations are based on temperatures of 77°F.

Surface and Product Preparation- Gel Coat Repair

Thoroughly sand the area to be repaired to a 80 to 180 grit finish. Blend and mix completely equal parts of Duratec Polyester Clear Hi-Gloss Additive and the gel coat required for the repair or overspray. Catalyze at 2% with MEKP catalyst. Thin 5 to 10% if necessary to a desired spray viscosity with solvent or a fast acrylic lacquer thinner.

Application Procedures - Gel Coat Repair

Note: Spray pressures should be 35 to 50 psi. If a pressure pot is used, provide 10 to 15 psi pot pressure. Spray the entire surface to be repaired with a fine mist coat and wait 2 minutes for the solvents to flash off. Follow with wet coats, overlapping the surrounding area to ensure complete coverage.

Note: Do not inhibit the cure by adding wax surfacing agents. The combined gel coat and Duratec Polyester Clear Hi-Gloss Additive will air cure to a hard, glossy finish in approximately 1 to 2 hours. (Apply forced air heat for a 30-minute cure time). Lightly sand the repair area with 320 to 800 grit sandpaper, either wet or dry, and buff to the desired finish, ensuring that the newly gel-coated area is blended with the surrounding gel coat surface. Use our #1102-A and #1103-A Polishing Compounds with a #1104-A Buffing Pad to achieve a glossy swirl, mark-free finish.

Surface Product Preparation - Tooling Gel Coat Upgrade

Blend 5 to 15% of Duratec Polyester Clear Hi-Gloss Additive to the tooling gel coat. The viscosity and thixotropic properties of the gel coat will determine the quantity to be added. ( The higher the viscosity and thixotropic properties, the more additive is required.) After blending, catalyze at the rate suggested by the tooling gel coat manufacturer.

Application Procedures - Tooling Gel Coat Upgrade

Spray as recommended by the tooling gel coat manufacturer. Due to the lower viscosity, an extra wet pass may be required to achieve wet coat total film thickness. Gel and tack times are comparable to the straight tooling gel coat. Laminate as usual when the additive/tooling gel coat blend "tacks off" to the thumbprint stage.

Frequently Asked Questions

Q: If I use this product, do I still need styrene wax to get a complete cure in top-coating situations?
A: No. For added insurance, you could spray PVA over the gel coat as another means to seal out the air. Only add styrene wax if performing boat hull repairs below the waterline.

Q: What is the advantage of using the Hi-Gloss Additive versus styrene or styrene wax?
A: This product both thins and helps increase the gloss of cured gel coats. It allows a full cure without wax, which must be removed by sanding.

Q: Will the Hi-Gloss Additive cause clear gel coat to become cloudy?
A: No.

Safety Precautions

Duratec Polyester Clear Hi-Gloss Additive is extremely flammable. Do not spray near sparks, open flame, or heat. Keep area ventilated. Avoid continuous breathing of vapor or spray mist. Do not smoke while using this product or ingest this product. See MSDS for more details.

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Fibre Glast Development Corp.
385 Carr Drive
Brookville, OH 45309
Phone: 800-838-8984
Fax: 937-833-6555

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