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Thread: Using epoxy without topcoat?

  1. #11
    Registered Member chevynut's Avatar
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    Well I found out that Xylene does attack DPLF so that's out. It's not as aggressive as acetone, but DPLF does not have "excellent" resistance to it like an epoxy is supposed to have.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


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  2. #12
    Registered Member MP&C's Avatar
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    I had primed some motorcycle tanks once and forgot about cleaning the inside for sealing the inside (customer request). This involves shaking the tank with a section of sash chain and MEK solution inside. Splashed MEK all down the outside, guide coat RUNS off the side with the MEK. Never touched the epoxy. This was House of Kolor KP2.
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  3. #13
    Registered Member chevynut's Avatar
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    Anyone know how long it takes for SPI epoxy to cure to the point that it's chemical resistant? Two hours after I sprayed it acetone took it off, but I know that's not long enough to cure. What solvents is it resistant to? I need to spray the timing numbers on my damper with white paint and wipe the rest off with something that won't attack the SPI epoxy.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  4. #14
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    Call the owner of SPI, he is available almost anytime 7 days except after 5PM on Wednesdays. He has all the answers and will talk to you as long as it takes to fully answer all your questions.
    404-307-9740

  5. #15
    Registered Member Tabasco's Avatar
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    Use white latex exterior house paint on the numbers. Wipe over with a damp rag. Problem solved.

  6. #16
    Registered Member chevynut's Avatar
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    Tabasco, that's not a bad idea.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  7. #17
    Registered Member chevynut's Avatar
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    After 24 hours I found that acetone still takes the SPI epoxy off, and so does lacquer thinner. In fact the lacquer thinner attacks it more readily than the acetone. I read on a SPI forum that the epoxy takes 7 days to fully cure.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  8. #18
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    Lacquer thinner is a lot more aggressive than acetone in my experience. Just in general.

    It's not clear what you're up to here other than painting the marks on your balancer mentioned in your other thread. Epoxy does take a while to cure fully, even if you can touch it, paint over it, etc. prior to full cure. In fact I think that's intentional, as a "compatible" topcoat will have a chemical bond to it, specifically because of that cure time.

    I think Tabasco's simple solution will work - or maybe things will change if you wait a week.

  9. #19
    Registered Member chevynut's Avatar
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    Part of what I'm interested in is how good the solvent resistance is for SPI epoxy in general. The specific task right now is the damper markings. I want to make them a lot more visible than they are. The TDC mark is easy, but the other marks are hard to see.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  10. #20
    Member mech393's Avatar
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    I have used por-15 on my under carriage but also can be painted chassis black so the sun won't damage it but chemicals won't harm it and you can beat it with a hammer and it won't chip but once its on there its not coming off. it also can be brushed on and when it dries it becomes smooth no brush marks the only thing bad about it is you must use it in a ventilated area and if you get it on your hands it not coming off.

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