I've "gone to school" recently on paint prep.
Learned a couple things, some the hard way:
1. CNH spray can primer is a sealer, CNH quart-can primer is a surfacer. Why it's not noted I don't know, the only clue is that the spray can says nothing about sanding while the quart can refers to sanding recommendations.
2. Krylon primer surfacer seems to be good stuff, doesn't raise when covered with CNH primer sealer.
3. When using a polyester spot putty as a filler, it needs to be mixed liberally with hardener, otherwise it doesn't cure enough to knock down easily . . . mix in small batches of course.
4. The rubber/plastic body knives are more of a pain on straight tractor sheetmetal, steel drywall knives work much better and make for less work.
5. Have a can of spray paint sripper handy, when mistakes happen it's much easier to hit them with the stripper and watch mistakes melt away is much easier than fussing with the sandblaster or wire cup brush some more.
6. Lye (Red Devil) paint stripper solution works much better than anything but aircraft grade paint strippers, must be something about the older paints.
7. Using a flat piece of aluminum as a backing behind steel to fill holes works just as well as a flat piece of copper, and is much easier to find, BUT the oxidation has to be removed from the aluminum before each use otherwise the weld is pretty porous.
8. Asking for help on this forum, at the risk of looking like a moron, saves a lot of pulled hairs. THANKS!
<font size="-2">9. I'm not looking foreward to doing the hood!</font>
Here's before prep - after lye stripping. Note the holes in the dash.
Here's today, before it gets some 935 white and clearcoat at the painter.