Ignoramus885 wrote:
I wanted to make some "outrigger pads", which are square pads
something like 24x24x3" thick. I have some scrap polyethylene cutoffs
and I was wondering, if I just melt and cast them, do I lose any
possible assurance of strength?

Just melting and casting scraps, void free, without starting a huge sticky
fire will be quite the project by itself.