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Storage Of Unfinished Unpainted Shell

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#16 nicklouse


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Posted 16 July 2018 - 01:52 PM

Thanks all, very good advice.


Apologies if this is a stupid question:


Is epoxy primer the same as high-build primer?  If not, would high-build primer work just as well at sealing out moisture?

not the same. and not really.

#17 superchiwawa


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Posted 17 July 2018 - 12:39 AM



Professional body shops are able to prepare, prime and finish in a controlled environment. When working in anything other than the perfect environment, atmospheric conditions and your primer's ability to cope with them is vitally important. Easy sand body shop primers are porous and if not painted in a controlled environment within a specified period of time, will absorb moisture, this leads to corrosion.



As I understand it, all your average non specialist primers are porous.


An epoxy primer has ... epoxy... in it, meaning its formula contains those type molecules, as opposed to urethane primer


A high build primer builds up a thick coat with the purpose of smoothing out the various light imperfections of the substrate, in a thick layer per pass ready for sanding. I'm guessing these are generally designed as easy sanding, since they are probably by design intended for body shops to save time (=money).


I also presume that the two are not mutually exclusive...


Then you have etch primers, which are older tech, and bond chemically with the metal through an acid reaction. Some people swear by etch, others by epoxy. Google etch primer vs epoxy primer if you want to enjoy getting a definitive answer on that one... :)


From what I've read (and having asked myself similar questions), epoxy primer sounds like a good solution to your problem. Keep in mind that each formula varies between products (epoxy content...?), so choose well.


Just be sure to have the correct surface roughness for it to adhere to, since it bonds mechanically (get your sand paper out).



Edited by superchiwawa, 17 July 2018 - 12:48 AM.

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