In today’s video we are going to show you how to hopefully avoid the wrinkles in gelcoat which are sometimes referred to as Alligatoring or pickling of a gelcoat.
* some further info.... As quite rightly mentioned by one of our viewers, we are showing what the ideal temperatures and dosages are for resins. We don't however explain how you can increase catalyst dosage to compensate for low temperatures, this is because we do not know which polyester system you will be using and some polyester resins behave differently and it depends on their intended final use. For example tooling or chemical resistant resin systems should never be applied at low temperature as they usually need an initial ambient cure followed by a high temperature post cure to reach their optimum chemical resistance or high temp resistance. It is always best to speak to your current supplier about the resin you are using before deciding to go against the product's data sheet recommendations.
You usually need your second layer of gelcoat or resin to cure within an hour at the very most. for most general purpose resin systems this would be achieved at approx 15-20 deg C by adding around 2% catalyst, between 10-15 deg C add approx 3% .
For sheathing work such as GRP roofing or general repair you can work at 5-10degC with around 4% or 5% catalyst addition, we just wouldn't recommend going this low for moulding applications. even a slow curing first gelcoat can attack some release systems.
Негізгі бет How to Avoid Gelcoat Wrinkling (Alligatoring) What to Do, and what NOT to Do!
Пікірлер: 10