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Step 1 Mold Polish and Step 2 Mold Polish
Produce Lasting, High-Gloss Polished Surfaces

These two compounds work together, and pack a one-two-punch-for-polish after parts have been sanded. Not only do they produce an impressive shine, but both are formulated so that fabricators use only about half the amount of compound compared to traditional materials.
  • Step One picks up where sanding leaves off and removes scratches left behind by 600- to 1000-grit sandpaper. This fast-cutting compound will also remove styrene and wax build-up from molds. Step One is blue in color.
  • Follow-up with Step Two to remove even finer scratches and produce an exceptionally high-gloss surface. Step Two is white in color.

Both compounds are water based, and just right for polishing FRP parts, molds, and even painted surfaces.

For best results, apply #1102 and #1103 with a powered rotary buffer at 2500 rpms, and use with our #1104-A buffing pads.
MEKP Hardener
Industry Standard Catalyst

Methyl Ethyl Ketone Peroxide, or MEKP, is required with all polyester resins, gel coats and vinyl ester resin. It is required in different concentrations as defined for each resin product.

Each resin product is available as a kit with the correct amount of hardener. However, hardener may be purchased individually as shown here.
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 Gray Surfacing Primer

This is an all in one coat! Duratec Polyester Surfacing Primer provides rapid coat build-up and a smooth surface with high gloss. Use it with composite plugs and patterns, and to prime a growing number of wood products–including furniture, musical instruments, and architectural applications.

1) Low Porosity – It provides a super-fine leveling and filling system on a variety of substrates with superior release properties.

2) Adhesion to Most Epoxies – With a heat distortion level of 201°F, this primer also adheres to fiberglass, properly prepared metal, wood, medium density fiberboard, brick, concrete and polyurethane foam

3) Rapid Coat Build-up – Build to 40 mils, 1000 microns, wet on wet, on composite plugs, and master mold surfaces; this primer saves time and labor costs.

4) Easy Sanding – Save even more time and labor. It cures to a surface that will polish to a high gloss, when required.

Product Properties
Viscosity - As measured on a Brookfield Viscometer Model RVF, Spindle #5 at 2.5 rpm. 2700 CPS
Thixotropic Index 5
Gel Time - Sample based on a 100 g mass, catalyzed at 2 percent with MEKP 16-18 min.
Weight per Gallon 10.9 lbs
Volatile Organic Compounds 199 g/l
Coverage per Gallon - 10 mil thickness 110-115 sq ft


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

Starting from a correctly shaped and dimensionally stable plug, sand the entire surface with a coarse sandpaper (80 to 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. Thin 10-30% with a fast acrylic lacquer thinner after catalyzation, if necessary, to achieve a desired spray viscosity.

Application Procedures

Note: Spray pressures should be 35 to 50 psi. If a pressure pot is used, provide 10 to 15 psi pot pressure.

Apply a "tack coat" to the entire surface and allow it to flash for 2 minutes. Follow with wet passes, slowly building to the desired thickness (10 to 40 mils). Heavier thickness can be achieved by repeating the process immediately after gel has occurred. The primer will be dry to the touch in 1 to 4 hours, depending on the thickness and temperature, and ready to sand within 24 hours. Dry sand the entire surface with 80 to 120 grit sandpaper. Wipe the surface with fast solvent and a clean white cloth or paper towel. Do not use a tack rag. Wait overnight for the solvent to release and a complete cure to develop. Again spray the primer as directed. If an even higher gloss is desired, blend the primer one-to-one with Duratec Polyester Clear Hi-Gloss Additive (#1040-B), thin with a fast acrylic lacquer thinner, and spray to the desired thickness following equipment directions. Sand to a 600-or-higher-grit finish. (Note: For best results, after sanding, wait overnight before compounding and polishing the surface.) Remove scratches with #1102 Polishing Compound and polish with #1103 Polishing Compound for a glossy swirl, mark-free finish. No surface cleaning is necessary prior to the application of release materials.

Frequently Asked Questions

Q: Can this primer be applied with a brush or roller?
A: Yes, but spraying will deliver a better finish.

Safety Precautions

Duratec Polyester Surfacing Primer 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.

Troubleshooting Guide
Problem Cause Solution

Not enough catalyst used

Substrate/primer incompatibility Chemical reaction

Primer sprayed on cold surface

Check for proper catalyst levels

Check compatibility of surface and product

Expose surface to higher Temperature before spraying when Ambient temp is below 60°

Blisters Substrate not cured, Gassing underneath primer Completely cure putties, pastes and compounds before applying primer
Cracking Primer spray too thickly, too fast Increase the number of passes, adding dwell time between coats. For exceptionally thick buildup, allow fore gel to occur before spraying further.
Dimples (craters) Film buildup too rapid, solvent trapped in primer. Increase the number of passes to achieve desired thickness. Allow for "flash off" between passes.
Dry over-spray

Acetone used as thinner

Spray gun orifice too small.

Spray pressure too high.

Use slower solvent such as a fast acrylic lacquer thinner.

Use larger orifice.

Set line pressure at 35-50 psi.


Substrate contaminated.

Contamination in the air

Contamination in the air line

Do not use a "tack rag", slow evaporating solvent

Spray in a clean area to minimize airborne dust, water, waxes, and/or silicones.

Spray with dry filtered air.

Gelling in the Container Outdated product Replace with new primer
Lifting or Peeling Substrate not cured or substrate/primer incompatibility Completely cure putties, pastes, and compounds before applying primer. Check compatibility of surfaces and products.
Orange Peel

Spray equipment set up incorrectly

Spray pressure incorrect

Pot pressure incorrect.

Viscosity too high

Follow the instructions for equipment set up.

Set pressure at 35-50 psi.

Set pressure at 10-12 psi.

Thin with fast acrylic lacquer thinner.

Pattern surface sticks to mold upon release. Improper release preparation

Primer not fully cured before compounding and polishing

Excessive gel time for tooling gel coat.
Follow manufacturer's instructions when applying release materials.

Follow instructions above fore pattern surfacing.

Follw manufacturer's recommendations for gel time.
Pinholes Substrate Porosity Fill porous areas with product using squeegee, brush or roller before spraying
Plug/Pattern surface not hard or glossy

Primer not allowed to "breathe" after sanding.

Surface wet sanded when under cured; primer absorbed water.

Ambient temperature under 60° F when sprayed.

Low reactivity catalyst used.

Allow time for solvents to escape before compounding and polishing

Dry sand with initial sanding step. Wet sand after breathing occurs.

Expose surface to higher temperature before spraying.

Do not use a catalyst with less than 8.8 percent active oxygen.

Plug/Pattern surface loses porosity

Primer not fully cured prior to compounding and polishing.

Spray pressure too high

Spray orifice too small

Acetone used as a thinner

Dry sand with initial sanding step. Wet sand after "breathing" occurs.

Reduce pressrue to 35-50 PSI.

Use larger orifice.

Use a fast acrylic lacquer thinner.

Print through (developed during mold building) transfers to mold.

Putties, pastes and compounds under primer not fully cured.

Putties, pastes and compounds post-shrink with exposure to excessive exotherm

Exposure to excessive exotherm during mold building

Completely cure putties, pastes and compounds before priming.

Qualify putties, pastes and compounds for acceptable heat distortion temperatures.

Maintain exotherm below 200°F during mold building.

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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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