AK_Skeeter
WKR
Yes metal screening on the backside works well. Great tip! Just fixed a cracked wheel barrow bed this morning using plastic welding and metal screening melted in .I have a different cheap plastic "welder". Basically just a flat shoe soldering iron, but have used it extensively to fix all kinds of things, including the kids' atv fenders. Metal window screen makes a great strengthening material as well.
I do like those hot staples for tight spots were it is difficult to get metal screening in. After hot staples are in the plastic, I go over one last time to plastic weld over the staples on the backside.