[Aussie Mike]

Some of my favourite tools:

An 8" grinder with a belt linisher attachment on the end. I use a fine stone on the other end for sharpening tool steel for the lathe. The belt linisher id great for shaping parts and cleaning up welds or preping parts for welding. You can get a variety of belts in different grits. I also use scotchbrite belts for prepping parts for polishing.

Another favorite is a 6" grinder with a taper on one end to hold polishing mops and a whire wheel on the other end. Metal polishing is actually quite easy and reasonably inexpensive once you get set up and learn the basic techniques. The wire wheel is great for cleaning threads on bolts and other stubborn cleaning jobs. I probably should buy an 8" grinder to use as a buff but the 6" works OK. An 8" buff would probably just throw the parts further across the shed when it grabs an edge.

Both grinder an buffer are mounted on pedestals that I welded up. This gives you plenty of room to work around them. When they are mounted on a bench they chew up valuable bench space and make a mess.

As Leeroy mentioned the Nutsert tool is a must have. They make for a very professional finish and a reliable stress free fixing into fiberglass.

Get your self a little rool around gas lift stool. It'll save your back and knees when working down low on the car. They usually have a handy tray in the bottom to hold your tools.

Cheers