Tips, and Cautions
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Polyester membrane application
In a bathroom wet area
HANDY TIPS:
Mixing ratio of catalyst to Polyester resin is 1 % of resin volume. For example, 1 litre of Polyester resin will require 10- mls of catalyst.
The exothermic reaction between the mixed hardener and resin causes the specific CSM fibreglass to soften, usually within a few minutes of wetting out the fibreglass matting reinforcement.
Use a brush to shape the fiberglass matting tightly into the edges/corners, taking care to remove entrapped air bubbles and use the roller to saturate the resin through the fibreglass to mould the shell into the walls and floor.
Subsequent layering of fiberglass will give the installer a higher degree of membrane strength.
Squeezing out catalysed resin from rollers and brushes before mixing the next container of resin will ensure the resin filled brush/ rollers remain at the beginning of the exothermic reaction cycle for around 2 mixes at a rate of about 20 minutes.
Caution:
It is important that the catalyst and resin is mixed thoroughly before use to reach a full thermoset cure!
Pot life of mixed resin and MEKP catalyst is around 20 minutes, (Meaning) only mix what you can use in that time frame, starting with a small roller, wet out perimetres and then continue to pass over the area a second and third time wetting out and mold and softening fibreglass with roller and brush until the layer is uniform.
• DISPERSE MIXED RESIN PROMPTLY TO AVOID HEAT DEVELOPMENT
• MIXED MATERIAL LEFT IN THE CONTAINER WILL RAPIDLY HARDEN
Before mixing any resins or catalyst/hardeners ensure that you are using the correct
PPE equipment recommended.
• Safety glasses
• Breathing respirator
• Latex/Nitrile disposable gloves
• Create a well-ventilated work area by using an extraction fan in confined spaces.
• Always use ventilation and a combination filtered mask that is approved for Organic Peroxide when mixing and applying Resin/MEKP Catalyst with fiberglass in confined space.
• If contact is made with skin clean off excess resin/MEKP Catalyst with rag and wash skin with soap and water to prevent burns.
• If contact is made with eyes immediately flush out resin/MEKP Catalyst with water for up to 10 minutes or as long as it takes.
• If swallowed do not induce vomiting, rinse mouth out with water and call a physician immediately.
• If overcome by fumes, move persons into fresh air.
• Resin spills: Clean up with inert absorbent material.
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