Duratec Clear Hi-Gloss Gel Coat Additive

Duratec ProductsGet 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

Use with Plugs

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.

Gel Coat Repair

Surface and Product Preparation

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

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.

Tooling Gel Coat Upgrade

Duratec with Tooling Gel CoatSurface and Product Preparation

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

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 Hi-Gloss on Carbon Gas TankDuratec 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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