Does SPI epoxy have any acid in it? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-30-2011, 07:14 PM
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Does SPI epoxy have any acid in it?

The tech sheet says in bold "This epoxy eliminates the need for an acid- etch primer."

Does than mean it has some acid in it?

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Old 09-30-2011, 11:21 PM
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no sir. it means that acid etch primers/washes are a thing of the past. Epoxies of any kind (not just SPI) are leaps and bounds above etch.

Try some on a sheet of metal, or concrete, or even wax paper lol. You'll understand why when you see the adhesion differences.

some people will still use etch primers and then seal with epoxies. This is discouraged, as the acids can sometimes hide in crevices and come back to ruin a great paint job. Its also kind of dumb as etch primers really have no adhesion compared to a good epoxy. Your first coat of anything is the most important when it comes to adhesion.

- would you spend hundreds of dollars on paint and cut and buff a job that was laid on top of a weak first coat?
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Old 10-01-2011, 09:06 AM
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Great answer by bowtie.

This question, I get a lot on lots of different brands and different types and think it deserves an answer.

First question is, do you know if this product has an acid in it?
Fastest way to figure that out is if it does, one of the parts will be packaged in either a glass or plastic container.

Next most common question, I have had this reducer for years, is it still good?

Yes it will go bad when the inside of the can rusts and even then if the can is just starting to rust and nothing floating around and the reducer has not started to yellow it will be OK but straining should be included.

If in doubt use as a primer reducer or to clean your guns, no need to waste.
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