heat gun

So i am planning to build a EVA C-Variant Helmet for my Spartan Armor, and since i do not own a toast oven for heating up the plexiglass sheets, i just wanted to ask, if it is possible to heat up the glass with my heat gun.

Hi I am new to costume making and have been messing around with it for about a week mostly with cutting and stuff and I am trying to follow a tutorial series on youtube that can help me get started, it tells you to heat the EVA foam to the point where is moldable however I don't know what point...