What would you guys recommend to use, what methods to go from this...
would you use like fiberglass, or 'weld' in another piece of plastic?
This would all depend upon the bumper being OEM or aftermarket..
If OEM, then definately plastic weld the holes shut, and finish off with the appropriate plastic repair products (3M, Norton, Fusor, etc).
If the bumper is a fiberglass replica, then you would want to go the fiberglass route. And finish it off with body filler.
Plastic welding requires a Plastic Welder. Which I assume a first timer won't have. Go on eBay. Buy a 3M two part gun and a tube of Panel Bond 8115, that will cost you under $100. You will also be able to do many other tasks with this gun. Read the directions in the bag. Gle pieces of a donor bumper"free" from body shop dumpster. Then carry on with finish work.
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Some of the materials used on new bumpers are not plastic weldable. The rear R32 I did was that.
I personally used Fusor for this. I ended up doing it twice and had no experience. Had it painted twice.
^^ yeah, I used scraps from an old passat bumper. It was black plastic too. The R bumpers are this wierd, I wanna say abs but I don't think it is. I had a DIY thread but my pics are dead.