Hello board, -I am totally new in this world - so mistakes are been done..

Can anyone please help me solve some issues that i am having, 
I have tried to make my frist mould - indoor, since the weather is to cold to heat up my shed that i would normally use for this. 
So since ithe work is going to be indoor,  i have bought Jotum TopGloss gelcoat that is Resin-based instead of normal poly-based gelcoat. 

But first of all, after a long preparation of my part that i need to copy, i started to make the gelcoat (Jotum) and experienced that it is very thin. I paintet it on andafter some curing i started to lay fiberglass on and added West resin on top.
Now my part heatet up and smoke where visible as well. -So i guess that there has been some sort of chemical reaction that made it self-destruct..

So here is my question, is there any method to make moulds inside without ventilation ?
And if so, what would be the right products to use for it ?

Thanks , and happy newyear

Soren

Just had a quick look at this Jotun TopGloss - that is a topcoat paint for final finishing, it isn't for making moulds.

As for the smoke and heat while laying up, that sounds like you had a thermal runaway which is to be avoided, but quite normal. Just google "thermoset resins" and "thermal runaways" and you'll find out what that is and why it happens and how to avoid it. 

For making moulds, you really need to be using the correct gear. If you have to do it inside, then it needs to be epoxy - which makes things a lot harder and more expensive. Polyester and vinyl ester resins may stink, but they are very user friendly. Epoxy not so much. 

If you are using West System resin, then that is ok for moulds that will be used at ambient temperature. You just really need to find an epoxy gelcoat to go with it, ideally a proper epoxy tooling gelcoat. Lose the Jotun TopGloss.

Thank you for your reply,

It sounds right with "Thermoset" that explains the heat and qick hardening process.

Ok so it seems like it is cheaper to heat up my shed than  finding the product that is suitable for indoor work.
The guy who sold me the Jotum product claimed that it worked as gelcoat, and could be used for mould as well.  - and it was not cheap : )

But i will proceed with a heater and the "normal" gelcoat , wich i allready have plenty off .

Thanks again,
Happy newyear !

Best regards, Søren