Hello,

I am using a plug that is sealed with 2k primer and 6 coats of easy lease release agent.

I applied a coat of easy composites high temp gel coat and let cure for 1.5 hours. Came back and it's no longer tacky...
The sun had moved and heated the molds. Should I be concerned applying the second layer of gel coat in fear of delamination between gel coat layers. Reinforcement is el160 high temp epoxy with 2 100gsm and 3 450gsm fiberglass layers.

Just be careful, as first impressions may be a bit misleading. It will bond initially, but it may not be a good bond and could be prone to delamination or bubbling over time, especially if this is a mould that will be exposed to heat cycles.

That said, if you sanded the surface well then there should be no real concerns - it should bond very well mechanically to itself, so you will likely not notice the difference between this mould and one laid up during the tacky stage.

Definitely a huge fan of chemical release agents. Vastly superior to more traditional release agents.