Isolating Primer Advice Please

[peterguk M500]

Hi Guys

I'm in the process of producing a custom front clam for my Noble involving carbon pieces, gel coat repairs etc.

My painter, whom i have every faith in, and does sall my customer work, has expressed concern at possible blemishes caused by some sort of "sinkage", sometimes not appearing for weeks/months. To do with GRP and epoxy resins, both of which i am using.

So, anyone got any recommendations for a top isolator? Cost not important, but must fully isolate GRP, carbon etc from subsequent base coat / lacquers.

Edited by peterguk M500 on Monday 8th March 22:43

[V8covin]

Generally sinkage occurs with solvents drying out so to minimize allow all your materials plenty of time to fully cure before going on to the next stage,especially with a high build primer.

I understand it's quite common in USA to apply a sealer coat which I think is epoxy based between the primer and basecoat but it needs to be done in a totally clean environment as it cannot be flatted.
I've never felt the need to be honest and is not something my paint suppliers even stock