Handwoven Kevlar

When you talk about heat and vacuum, it depends upon the resin.

Room temperature cure doesn't need heat - MOST of those resins are not helped by help, but there are exceptions.
Vacuum will make a better laminate (less resin) but only if you don't use too much to start with.

Then there are professional type "autoclave" resins, which need heat, vacumn, and pressure to make the best/ lightest/ highest strength laminates.
Just add cubic dollars to handle the process.

Then there are exceptions to every rule.

Heating room temperature resin can make it lower viscosity - thinner, but will shorten the time before the resin sets.

And that's only talking about the epoxys I know.