Using Gelcoat Brushing (White, Black & Neutral)
Brushing gel coat is a basic for hand laminating fabricating and will remain tacky between coats allowing re-coating if required. Use for repair work and interior coating. Isophthalic grade is the upper grade of resins which means the product is waterproof and is suitable to use below the water line. It has limited chemical resistance but is suitable for mild acids. For best practice, it’s best to test the chemical for any adverse effects.
How to Use:
Use Rayplex Pigments only. They are made specifically for gelcoats and should be used when tinting or coloring polyester gelcoat. Any chemical foreign to the polyester can interrupt the curing process and damage properties. No more than 1 ounce of color agent should be added to a quart of white gel coat.
1) Don't over catalyze as this will prevent the gel coat form curing properly. Gelcoat is still tacky (a finger leaves a fingerprint) after hardener has been mixed into the resin and proper cure time has elapsed. Never exceed 2% catalyst by volume or below .5%. We recommend not using this product below 60F. See the Catalyst mixing guide in the Tech Tips section of www.fibreglass.com. Always mix in clean containers, used coffee cups can impart a yellow cast to gel coat.
2) It is recommended that gel time be checked in the customer's plant because age, temperature, humidity and catalyst will produce varied gel times.
3) Never thin with or add acetone as this will inhibit the gel coat from curing properly and will be soft. Use streyne to thin with.
Prior to full cure, gel coat can be removed with acetone. Be sure to put all tools into an acetone bath before the gel coat has time to harden.
Information present herein has been compiled from sources considered to be dependable and is accurate and reliable to the best of our knowledge and belief but is not guaranteed to be so. Nothing herein is to be construed as recommending any practice or any product violation of any patent or in violation of any law or regulation. It is the user’s responsibility to determine for himself the suitability of any material for a specific purpose and to adopt such safety precautions as may be necessary. We make no warranty as to the results to be obtained in using any material and, since conditions of use are not under our control, we must necessarily disclaim all liability with respect to the use of any material supplied by us. Rayplex Ltd