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Old 08-14-2013, 06:17 AM
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All epoxy does is provide the best seal for metal against rust ,it does not stop or prevent rust if you just spray over it. the rust issue needs to be addressed before using the epoxy the epoxy then seals it all up (like a condom) ... most epoxies do that, what makes SPI so special is its easy to sand and build so theres no need for any other primers...You can go from bare metal all the way to paint using only this one eopxy, with almost all the other epoxies they dont sand well so you need another primer after the epoxy that you can sand easily...the problems with putting another primer over it are the 2 k primers tend to shrink more and get sand scratch swelling and they chip a lot easier like door edges and rock chips on the front of the car. so eliminating the 2k primer and only using epoxy makes a longer lasting and better job....
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