what is the best way to fill the trim holes?

I weld mine. An easy way is to tap them in (just a tiny bit) with a ball-peen hammer, and fill them with bondo. This also seems to hold up quite well.

I filled my trim holes 8 years ago. I did like Randy said and indented them a little. Used some very coarse sand paper to scratch them up. I used fiberglass filler first and really jabbed it into the holes, then used bondo. I was told that the fiberglass is waterproof.
It worked great. Too well, actually 'cause it was a buggar trying to find the holes so I could put the trim back on again.:)

I weld mine using a copper "spoon" held on the back side. If the back side is inaccessible, I just slowly make tacks around the edge of the hole till it fills. I've done that on holes as large as 1/2".

A little trick, instead of a ball peen take a die grinder with a small disc 1'' and concave the hole that don't dent the part as much.:bowtie: :flag: :bowtie:

I pulled the trim off today and am dreading filling ALL THOSE HOLES. Damm there are alot of`em.

Any other tricks or suggestions?

I have tried a few ways over the last few years and all is still holding up. I have tried the fiberglass and bondo...that worked, Ive tried tac welding and that worked. I even tried putting duct tape on the back side and filling the hole with JB Weld (Against better judgement and for a temporary fix) and that worked too. For a longer lasting fill, I'd go the tac weld if possible, but if you go the fiberglass, bondo or JB weld route, go with a few very thin coats, it will last longer and take vibration better.

Dave

my dad welded mine, that was when i sucked at welding :)