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Old 08-17-2007, 02:52 PM
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sanding SPI epoxy?

I stripped my door jambs on my fairlane project with 80 grit rolocs to bare metal.How many coats of spi white epoxy should i shoot.What grit to sand with before topcoating with Dupont chromabase? Shouldi use a 2k uro primer after the epoxy as epoxy doesnt build much? Thanks Mike
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Old 08-17-2007, 03:12 PM
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Spray a wet coat of epoxy, let flash for 30 minutes and then spray a second coat.
Let set four hours or over night and then take a close look, if you held the 80 grit flat two coats will cover it, some areas like edges or humps you may see some slight scratches and for those areas shoot the europrime over that area with out sanding the epoxy. You have seven days to spray over the epoxy without sanding first be it base or primer.

Edit:

Now that I have time I would like to explain why I said do it the way I did in this situation.
We want a wet coat for two reasons, one epoxy loves surface tension for adhesion (wetting of surface) and next most important is we have 80 grit grinding marks to fill and we want the grinding marks filled not bridged with a dry coat, that will offer a chance for sucking in and showing scratches down the road.

The 30 minute flash time is overkill with good reason, when filling deep scratches we want to give the solvents an easier chance to evaporate out of those areas, where if a second coat is applied to fast the solvents will have more mils too escape through and this will slow the process down drastically.

Four hours: If the above procedure is followed in 2-3 hours after the second coat is sprayed any shrinking the the naked eye can see is finished.
So at that point what you see is what you get.

Last edited by BarryK; 08-17-2007 at 07:30 PM.
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Old 08-17-2007, 09:41 PM
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For jambs I usually shoot two coats of epoxy just like Barry suggests, then sand with 320 the next day, shoot one sealer coat of epoxy and then spray my color. If this is a project that you're not looking for optimum results in the jambs you could skip the sanding and sealer coat and just spray the color on if the epoxy looks smooth enough as sprayed. Hope this makes sense.

The average 80 grit scratch in bare steel will bury with two coats of SPI epoxy and if the flash time between coats was right there won't be enough shrinkage to see those scratches again.
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