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I am using acetone to dilute the gelcoat, will it cause any problems at the final product? (Question ID# FAQ342)
Do not use cleaning solvent or Acetone thinning (diluting) resins or gelcoats as this can lead to added pinholes, surface problems and premature yellowing. If you need to thin the gelcoat you can use Poliya GTM (gelcoat thinner mix) you can find the details at Thinners and monomers section or you might as well use styrene up to 2-3%. If you use more you will degrade the resin or gelcoat.
Why, Polipigment color paste is cured - hardened before the expiration date? (Question ID# FAQ343)
The main reason is you most likely stirred the color paste with a styrene, resin or gel coat contaminated stick or mixing equipment. Pigment pastes virtually does not contain any monomers to harden. Always you to clean stick to stir the color pastes. For more information please check How to mix color pastes section.
If I use high performance gel coat such as Polijel 215 and use standard white pigment from the market, will it cause any problems at the final product? (Question ID# FAQ344)
Yes, definitely. Outer layer is the most important part in any composite product or part, low quality color pastes doesnt have UV stabilizers and atmospheric protection additives. Even if you use the highest quality gel coat it will promote yellowing and fading you should prefer Polipigment 01 White for coloring or you can order Polijel 215 white ready to use.
I want to build a very light cast product, are there any fillers for this purpose? (Question ID# FAQ345)
To reduce the density and the total mass of the product you can use Glass and Plastic spherical hollow fillers, you can find more information at the fillers section.
I am planning to increase production volume, which process methods should I consider? (Question ID# FAQ346)
The volume and the production depends on the product size, shape and technical specifications but briefly.
Low volume production: Open molding (Hand lay-up, Spray-up | Chopped laminating), Vacuum Infusion molding, vacuum bag molding, casting.
Medium volume production : RTM (Resin transfer molding), filament winding, centrifugal casting, wet lay-up compression molding.
High volume production: SMC (Sheet molding compound), BMC (Bulk molding compound), TMC (Thick molding compound), LPMC, Pultrusion, Continuous Lamination.
I am working with open mold (spray-up) laminating, how can I improve the mechanical properties without a major investment? (Question ID# FAQ347)
You can switch to vacuum bagging or resin infusion methods to reduce entrapped air, compact the laminate and homogenous resin distribution. You can find more details at the Resin infusion section.
Can I use carbon fiber and aramid reinforcement materials with polyester resin? (Question ID# FAQ348)
No, you should not because polyester resin chemical structure is not truly compatible with carbon and aramid. If you are planning to increase mechanical properties you should consider NCFs with polyester resin. If you need to use carbon or aramid you can use with vinyl ester and/or epoxy resins for this purpose. You can find more information at the reinforcement materials section.
I am using Polivaks SV-6 and applying Polivaks Sivi PVA liquid release agent on top, the surface has wave forms and distortion, why? (Question ID# FAQ349)
Polivaks SV-6 is a standalone wax you shouldnt use with any other release agents. If your mold is risky or new you should use the two step Polivaks NSE system, first step Polivaks N and after drying second step Polivaks Sivi Pva liquid release agent layer. You can find more information at the Polivaks section.
If I use general purpose gelcoat for kitchen countertop production, will it cause any problems at the final product? (Question ID# FAQ350)
Yes, definitely. After the general purpose (lower quality) gel coat layer is exposed to water, detergent and kitchen household-chemicals the surface is going to fade, crack and deform. You can see similar results at the gel coat simulator section. You should prefer High performance gel coat such as Polijel 213 for this purpose.
We want to produce clear casting (transparent) small items using Polipol 354 clear casting polyester resin. We can't match clear color sometimes it is very purple sometimes it is quite yellow. How can we obtain acrylic like transparency using this resin? (Question ID# FAQ351)
You can obtain acrylic like crystal clear cast items using Polipol 354. There is couple of important steps. First make sure both the resin and the application environment temperature should be around 20C. Make sure the Cobalt solution (the purple colored chemical) used as accelerator should be 1% solution, widely used Cobalt solutions are either 6% or 8% which makes them excessively effective for clear casting application which effects color. Depending on the cast item weight, you can use the following table to determine the appropiriate Cobalt and MEK-P levels.
For easier calculation, you can use the weight table below.
Accelerators (Cobalt) must never be mixed with catalysts (MEK-P) since a violent explosive reaction results. This is why it is important that all accelerators are thoroughly mixed with the resin before adding the catalyst.