ive got some plans for a simple tarp tent, and in the process of building and rebuilding it in my head, ive come up with a few questions.

Most of the polyethylene ive found is 4 mil, is that thick enough?

I was thinking, theoretically, that i could somehow use heat to join two layers of visqueen to strengthen pressure points like stake holes. i was thinking i could either use a heated piece of metal, like a coat hanger, to "spot weld" two pieces together, or maybe use a plastic bag resealer to bond them. Has anyone tried this?

He who makes a beast of himself gets rid of the pain of being a man.
-Samuel Johnson