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After you sandblast, what do you guys normally do.
Do you give it some type of chemical wash before applying self-etching primer and or Zero Rust on the frame??
I'm not sure about the zero rust product, but I don't think any further prep is necessary for a self etching or epoxy primer, as long as it's done fairly soon after the sandblasting. (same day)
I try to wipe my panels with a 'wax and grease' remover before priming, just in case some one touched the panels. Oils from even a 'dry' hand can cause the paint to turn lose.
That is, be careful around the spindles, don't blast the drum faces (where the shoes meet the drum, I used duct tape on these fwiw), bearing and seal locations, etc.
The abrasives can pit the metal which will have deliterious effects!
If you do a really thorough job on something with a big buildup of old paint etc. it can take a lot of time and sand as you found out. A suggestion would be to go over it first with a grinder or wire wheel, anything to give the sandblaster less work to do.(sandblasting will take out many of the grinder marks you might leave)
I was thinking of spraying a layer of stripper to loosen the paint.
God, the previous owner layered a whole bunch of bondo in this dent instead of pulling or hammering the dent out. The guy must of had an inch of bondo in this dent.
Stripper works great on bondo - saves making a lot of dust by not having to grind it out. Load the stripper on, cover it up right away (with garbage bags or something) to keep the chemicals in the stripper from evaporating, and give it a few hours to work. A rigid putty knife or gasket scraper will dig the old filler out quick!