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Lots of things can cause this in poor prep work. But I usually find that this is caused by letting the bondo get wet at some point before the paint is applied. Bondo is like a sponge to water and even leaving it out in the rain in primer (which is porous) can get moisture in the bondo. There may be a skim coat of bondo under that paint there. Its also possible that the bondo is applied over holes in the metal, eather rust holes or trim holes or holes drilled in the panel to push the bondo through to hold it. this way water can get to the backside of the bondo and soak in. Keith > My '67 square has developed small bubbles in the paint, on the drivers > door. can this be anything other than rust under the paint? For > instance can simple bad paint prep work do this? > > the third picture on this page shows the bubbles: > > http://herbie.ddv.com/~fess/type3/issues/67_paint_job/ > > --fess ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~