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