zdmz Posted September 23, 2004 Share Posted September 23, 2004 I keep getting bubbles in my primer on the roof of the car I have sanded it off and redone it three of four times and it keep happening. I thought a first that maybe I had touched it after cleaning it and the oils from my hands were making it bubble. The last couple of times I primed it I was very careful not to touch anything - still bubbles. Now I think it is because I am spraying too much too soon between coats??? What do you think? My prep proceedure is to sand down to the metal ( nice shine with no visible rust or other impurities) - wipe with laquer thinner - and spray with primer. This method has worked well for everything esle on the car but the roof is giving me fits. Any input would be appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
Drax240z Posted September 23, 2004 Share Posted September 23, 2004 I have had the same problem... even if you sand them away/repaint they keep returning. Little tiny bumps, not exactly bubbles in my case, but certainly under the primer layer. The bubbles are consitant throughout the whole paint too, not just one area.. I know it isn't rust in this case. In the areas that I stripped to bare metal however there doesn't seem to be this problem. Quote Link to comment Share on other sites More sharing options...
zdmz Posted September 23, 2004 Author Share Posted September 23, 2004 I will try to get some pictures posted. I don't have a camera but I asked my brother to get some shots of it. Each time I respray the bubbles show up in a different spot so I don't think there is anything "wrong" with the metal. I have been spraying outside (no garage, yet) but still this has not happened anywhere else on the car!?!?!?!?! Quote Link to comment Share on other sites More sharing options...
Drax240z Posted September 23, 2004 Share Posted September 23, 2004 Actually RacerX in my case it is a single stage paint where this is happening, not base/clear. I have had people tell me it's dust below the primer, but I can't figure why it would take time to come to the surface if it was dust. (ie: paint surface looks fine for a while, then in a month or so I get a bunch of these little bumps coming back) I know the solution to the problem is to take it right down and start over, and that is what will happen before I do it again. Quote Link to comment Share on other sites More sharing options...
zdmz Posted September 23, 2004 Author Share Posted September 23, 2004 The bubbles are more air pockets than what would appear to be "grit". On some of the larger ones - about 316" in dia. - I have poked them with a knife and they peel up like a flap. If the reducer is bad I am not too excited about buying a whole gallon to repaint just the roof. could I just use some rattle can primer to patch in the affected areas or would I run into compatability problems??? thanks Quote Link to comment Share on other sites More sharing options...
zdmz Posted September 24, 2004 Author Share Posted September 24, 2004 I was able to create a person photo album under zdmz and post a photo. phew,,,what a task. Anyway I don't know how to post the picture here. It is a fairly decent shot and shows the bubbles clearly if enlarged. thanks. Quote Link to comment Share on other sites More sharing options...
COZY Z COLE Posted September 24, 2004 Share Posted September 24, 2004 Here you go. LARRY Quote Link to comment Share on other sites More sharing options...
Guest butlersZ Posted September 24, 2004 Share Posted September 24, 2004 The same "bubble" effect happened to me yesterday when I painted my hatch! The bubbles look the same as in that pic, my guess is either because I had left a little bit of etching primer on the hatch and didn't wash it all away, or because of moisture affecting the paint due to the high humidity where I live. Quote Link to comment Share on other sites More sharing options...
zdmz Posted September 24, 2004 Author Share Posted September 24, 2004 Humidity may be a factor here. I live in northern Nevada and it is usually very dry here, but it did rain a couple days before I did this primer application. Not sure why it would have bubbled on other occasions??? Larry, Thanks for posting the pic. Quote Link to comment Share on other sites More sharing options...
zdmz Posted September 24, 2004 Author Share Posted September 24, 2004 I am spraying directly to metal. I bit the bullet and bought more primer and am planning on re-doing the whole roof. Good point about the air line - it has been a while since I drained my compressor of moisture, I will look into that. Quote Link to comment Share on other sites More sharing options...
260DET Posted September 25, 2004 Share Posted September 25, 2004 Humidity may be a factor here. I live in northern Nevada and it is usually very dry here' date=' but it did rain a couple days before I did this primer application. Not sure why it would have bubbled on other occasions??? Larry, Thanks for posting the pic.[/quote'] What I was going to suggest, high humidity. Not good weather to paint a car in, can result in rust quickly forming under the new paint too Quote Link to comment Share on other sites More sharing options...
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