just general repairs like what you did. Tricks of the trade i guess. I've got one spot on my roof, just above the gutter. IDK how much experience you have, but I know some like certain products because they've found on their own that these product behave better for small repair as opposed as big repairs. One thing I have come across is when repairing body panels, the bit you weld in should be slightly smaller than the hole its going in. I would have made it the same size. Things kinda like that. Thanks.