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Painting a bio disaster


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We all learn.

Sometimes from others.

Sometimes the hard way.

 

Today I learned the hard way.

I got this P1 with plans to make I a movie accurate version. 

Story goes as follows.

1. Months ago, primed it with Rust-Oleum automotive primer.

Primer dried. But the primer cracked horrifically. Like a dry lake bed.

I blamed my prep work and body filler.

The cracking was frustrating so the project sat on the healing bench till this week. Wanted to get it on my wall.

 

2. Took the helmet off the shelf.

Sanded ALL the cracking away. Got it smooth. Ready for paint.

3. Painted with the same primer.

Got the same result. River bed cracking! Ffs.

 

Friends informed me that old cans of primer can gas off the solvent. When the solvent is reduced in the van the paint dries too fast. Making cracks.

So... The lesson learned.

Check the date on your cans before using them. Mine was 2019.PXL_20220915_142022025.thumb.jpg.e38305317c273d138988a3f0059299e1.jpg

Cracked primer. FML

 

PXL_20220915_125123690.thumb.jpg.0a4e1a6093d08a2cc83dddaa869f6733.jpg

all the sanding done prior to paint.

 

 

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  • 2 months later...

With the helmets I've painted in the past, I've used some form of automotive bonding primer. I've never heard of a reduced solvent aerosol, or how having reduced solvents would make the paint itself dry faster (that's why the solvents are there - to speed up the dry time) - apparently at a Superman rate. I've never used an adhesion promoter when painting a helmet - just primer and the basecoat. Is your shop too cold? Low temperatures will cause paint to kind of shrink up and recede - resulting in wrinkles and cracks in the finish. You know, kind of like your balls on a cold day... without the cracking part.  Also, storage of the cans is a factor. I keep mine indoors instead of the garage which can get down to freezing temps.

Edited by PredatoRob
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The wood filler could play a part in this and I wouldn't write it off. Or, like you said, the aerosols were just old - and old spray paint can do goofy and most unwanted things. I've got a "test" bio that I used to test out different colors and such, and I used 3M Spot Putty (basically a not-as-toxic bondo) and some plumbers epoxy along with other sculptable, hobby epoxies (milliput, etc) and I never had a problem with contamination. I have a hundred different reasons why that happened running through my head right now, and I can't focus on just one. 

How did you clean it before you shot the primer?

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