How To Fix Auto Paint Reactions – Cratering, Biting, and Wrinkling ๐Ÿš˜

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Hey, itโ€™s Tony from LearnAutoBodyAndPaint with another Q&A video. Hereโ€™s a question from Matt. 

โ€œHey Tony! I sanded, cleaned with degreaser and wiped off with a clean solvent cloth and water. Also used a tack cloth before painting. It looks like oil or something underneath. Iโ€™m going to let it dry, sand and try to repaint the area. Is this the proper way? Any ideas? Thank you! Mattโ€

This area in your paint project had a contamination. Something happened which is why this chemical reaction happened. 

Iโ€™m not sure why you need to use water. Usually, you can just use wax and grease remover then tack it down. That should be okay. 

It looks like oil based on the pictures you sent. Check out the video as I show you images of what Matt sent. This is his project and heโ€™s having a slight problem with it. 

Heโ€™s having a chemical reaction in this area where I encircled it. Itโ€™s basically paint not sticking in this area. This is a common contamination paint defect. 

This is called biting, wherein a paint is moving away from a certain area causing a crater. When you see your paint having this type of reaction, you need to stop. The more paint you put on it, the more it separates and the paint issue just worsens. 

You just need to wait and redo the whole area. Itโ€™s more work if you keep on putting on more paint that you have to sand out. 

I would normally wait for the base to get dry, which is about 15 minutes and lightly sand that area with 400 to 600-grit and water. 

Then, very lightly wax and grease remove the area. You need to do this very lightly because it will melt your base coat. 

You just need to do a light pass on it then tack it down and lastly dust it with new base coat. This is a tactic that I share in the LearnAutoBodyAndPaint VIP Program. If you are interested, go check out the VIP Program now.

For those newbies, grab your FREE 85-Page Auto Body And Paint Manual to start cranking on your own car projects.

If you to the LearnAutoBodyAndPaint website, I have a lot of blogs there that talk about paint reactions and how to fix these. Check them out now. 

Itโ€™s Tony from LearnAutoBodyAndPaint. Thanks for joining me today. Please donโ€™t forget to SMASH that Like button, Share and Subscribe to my channel. 

Talk soon! Cheers! 


Other Helpful Links:

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How To Fix Automotive Paint Reactions โ€“ Paint Biting Causes and Solutions

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