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Re: PPG Primer, catalyst and associated questions

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Author  [Modern View]

04-23-2013 14:34:26

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If you are using HVLP there is no easier primer than epoxy to use. As stated use 2 parts primer to 1 catalyst (the catalyst does NOT contain isocyanates). Use no reducer. Use the air pressure at the gun according to the amount stamped on the gun or in the instructions. Do not experiment because HVLP guns vary from about 30 to 50 psi, depending on the manufacturer. You have 3 days to topcoat the Omni version or 7 days to do the expensive version, otherwise you scuff and reapply. It can have surfacer or topcoat applied after 30 minutes. You do need supplied air for the hardener used in urethane, if that is what you are going to use.

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Luke R

04-26-2013 08:22:04

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 Re: PPG Primer, catalyst and associated questions in reply to CNKS, 04-23-2013 14:34:26  
You mentioned hardener. Should I put hardener in with the epoxy? We have the omni version. Also, I was wondering if it is sandable at all after applying? It sounds like it is set as soon as you spray for paint. Probably wouldn"t be good to use with the sheetmetal then? Thanks for the advice

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04-27-2013 13:26:00

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 Re: PPG Primer, catalyst and associated questions in reply to Luke R, 04-26-2013 08:22:04  
Epoxy has to have the catalyst or it won't work. it is ideal for sheet metal, cast or whatever. It is NOT sandable. On sheet metal it will give a good enough finish when top coated. For best results use a sandable surfacer over the epoxy. On relatively smooth surfaces such as battery boxes, generators, starters etc, or anything that is not the hood, gas tank, grill, etc, epoxy is fine when topcoated. A sandable primer, high build or otherwise does not adhere as good to the bare metal as epoxy. It is the only true primer that I use.

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Luke R

04-27-2013 19:26:17

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 Re: PPG Primer, catalyst and associated questions in reply to CNKS, 04-27-2013 13:26:00  
Can you spray multiple coats? If so, what are the correct steps to ensure it looks good? Again, thanks to everyone.

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