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Old 05-13-2017, 12:33 PM
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prep before epoxy primer?

I have a couple small areas I need to apply epoxy primer. One is a previously epoxied panel from summit. I want to scuff and apply a couple other layers of spi epoxy. Once scuffed what can I clean it with , I do not have waterborne wax and grease remover.

Also while here , I need to cover the inside brace to the panel and its pitted pretty bad. I will ospho and then sand blast to clean metal. Should I cover this with por15 or since its clean metal wash and give a couple layers of epoxy?

This previously rusted area is obviously prone to future rust so I need all the protection I can get.


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Old 05-13-2017, 08:55 PM
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Quote:
Originally Posted by Big Truck Driver View Post
I have a couple small areas I need to apply epoxy primer. One is a previously epoxied panel from summit. I want to scuff and apply a couple other layers of spi epoxy. Once scuffed what can I clean it with , I do not have waterborne wax and grease remover.

Also while here , I need to cover the inside brace to the panel and its pitted pretty bad. I will ospho and then sand blast to clean metal. Should I cover this with por15 or since its clean metal wash and give a couple layers of epoxy?

This previously rusted area is obviously prone to future rust so I need all the protection I can get.

There is no need for Ospho or POR 15 if you are going to sand blast it. Once it is blasted and clean just clean with W/G remover and prime with a couple of coats of Epoxy. There is nothing better you can do for it.

John
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Old 05-13-2017, 11:39 PM
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Originally Posted by John long View Post
There is no need for Ospho or POR 15 if you are going to sand blast it. Once it is blasted and clean just clean with W/G remover and prime with a couple of coats of Epoxy. There is nothing better you can do for it.

John
the sand blasting didnt get everything off there is still some spots off rust in the pits thar wont come out with the sandblast
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Old 05-14-2017, 05:50 AM
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the sand blasting didnt get everything off there is still some spots off rust in the pits thar wont come out with the sandblast
In that case, go ahead and scrubb it with the Ospho but be absolutely sure you rinse every bit off. Epoxy will not stick to acid residue. I try not to use acid but, sometimes you gotta do what you gotta do.

One of the guys on here suggested making a slurry out of sand blast media and Osho which he could use to scrub into the bottom of the pits. It sounded like an interesting idea to me.....again wash it all off. The acid must be neutralized.

Southern Polyurethanes (SPI) recommends 80 grit DA scratches for surface prep where possible. I religiously try to do that.

I will not, and have not, used POR 15. I want to get rid of the rust, not cover it up.

Best of luck.

John
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Old 05-20-2017, 12:06 PM
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Old 05-21-2017, 06:51 AM
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It certainly looks clean and rust free but the pits are too deep. you should probably replace that section, it wont last very long. Good job cleaning up the rust.
Make it yourself and have some fun.

Last edited by deadbodyman; 05-21-2017 at 07:18 AM.
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