I Need An Epoxy Resin Which Doesn't Heat Up Too Much!

Epoxy resins either have a mix ratio of 1:1 or 2:1, epoxies with a 1:1 ratio do get warmer as the exothermic reaction is faster and stronger which in turn creates more heat.

We would recommend having a look at our Alumilite Amazing Deep Pour and our Ecopoxy Flowcast:

These are both 2:1 resins and are slow curing which produces less heat.