Need paint advise, Primed and ready for a final sand Options

[Lennies914]

So I've been preping my '75 for paint for the last two weeks and figured I was ready for primer. So I thought I'd do a quick wipe down with acetone and a tack cloth then shoot some primer. Had I been more experienced at painting I probably would have realized sooner that the paint (repaint) that I have been sanding on for two weeks was lacquer (IMG:style_emoticons/default/headbang.gif) . The acetone imeadiatly started washing off the old paint. So hear is my question. Is there anything better and cheaper than acetone to wash down the car? Assuming that I cannot paint over the lacquer with acylic urethane.

[nathansnathan]

I haven't been able to find a reliable source to confirm either way - I had had read that it was Glasurit Lacquer, this on 914club, but then it wouldn't be the first time the doctor was not right.
http://www.914club.com/bbs2/index.php?showtopic=287242

I'd read that porsche (not Karmann) used different systems based on color, like the red was a single stage, the blue was base/clear, but this was 924-specific.