Re: What causes this?
I put all chrome pieces in the oven for a cure cycle to make sure the chrome will hold up. If it does and you're coating with a solid color just use a scotchbrite to scuff it up. If it's a candy/transparent clean well and coat. If the chrome doesn't hold up and bubbles it needs to be stripped.
As for your bubbles are you sure you stripped it all off? Is your air supply clean and dry? What type of metal are they? It looks like outgassing. Cast metals need to be outgassed to remove all junk trapped in the pores of the metal during the casting process.
Here's my process:
1. Clean and Degrease
2. Outgas in the oven (50 degrees or so above cure temp, try an hour)
3. Blast and blow off with air
4. Wipe down with the cleaner off your choice, (Acetone, pre paint cleaner etc. No petroleum based products) allow to dry or use clean dry air.
5. Go over them with a hand held propane torch to remove any rag lint, dust etc.
6. Coat and cure.
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