Vacuum infusion questions

[Seriola Dumeril]

I have finished my testbed for vacuum assisted resin infusion and I need
some info before going to "real" work!
First question is about printtrough - do I need to put few layers of mat on
the gelcoat with hand layup before applying VIP process?
Second question is if so much resin will generate enough heat that can ruin
some parts of the mold?
Any suggestions welcome!

[Herman]

Applying gelcoat and hand laminate a layer of glass behind it will help you fill the mould with fiberglass, (you can walk in the mould (carefully) but will also help you prevent print.

What is the thickness of the laminate that you are planning to infuse? A very thick laminate can build up considerable amounts of heat. There are additives that can reduce the peak temperature.

Dod you already do tests with the laminate that you are planning to use in production?

[Seriola Dumeril]

The tickness of the laminate have to be from 8 to 14mm. Until now I have only tested directly on the glass "mould" without gelcoat to check how high the resin can travel.
Sory for my broken english and thank you for your answer!

[Herman]

Your English is fine. Mine is not better anyhow.

14mm is a considerable thickness, and you should take measures to prevent resin burn. If possible, try and get resin with a CU8 solution added, or any other additive to lower the peak exotherm. This is definately important to reduce shrinkage and problems with the mould. Ask for it with your supplier. (Lonza?)

If you have more questions, please ask.