Hi
A bit off/ topic but if you were asking about plastic tube it will not
be heat that make the profesional solution ------- there are a mix of
acetone and tricloretylene quite common chemicals that make magic . If
you ever tried this fluid you never use anything else when having
trouble with a hose even halve the diameter of what it shuld be .
Acetone alone can do the trick but is a bit to heavy , anyway if you
place a plastic hose in this solution the diameter can grow up 3 times
what it was, then just leave it there where you want to put it then
when the fluid are vapored out the plastic hose is back to the original
size and very tight.

P.C.