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Old 09-29-2008, 12:34 PM
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Dupont epoxy recoat window...

I'm using Nason and my understanding is that the recoat window is 1 1/2 hours to 16 hours. After that, you have to scuff.

However, I've also read that they recommend waiting the full 16 hours before applying filler.

I'm going to be shooting Slick Sand on top of the epoxy. What recoat window would be appropriate? I definitely want to avoid having to scuff the entire truck.

Thanks...

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Old 09-29-2008, 10:53 PM
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Your best bet would be to call a DuPont rep or do some testing, but I would guess an overnight cure would be good before shooting the polyester primer. Maybe someone that uses Nason Epoxy will chime in and offer up their recomendations.
From the instructions you read on the tech sheet it sounds like they want 16hrs before polyesters are applied. Also very sketchy if scuffing is needed or not at the end of that recoat window. Give DuPont a call to be sure.

Here's the deal with spraying polyesters over epoxy primer, if you shoot it too soon the polyester will kick over slow and will also delay the epoxy cure. In extreme cases you might have some lifting and pulling along the perimeter of the part as the cure rates of the two products are so different. And the adhesion will be bad as there's no way for the poly to adhere to wet epoxy.

If you spray the poly on too late over cured epoxy without scuffing the adhesion will be poor because at this stage the only adhesion seen is by the poly's mechanical grip- and if the surface of the cured epoxy is smooth there's just no texture for good bond strength. Always sand/scuff cured epoxy before recoating.

There is an optimum time for polyester application without the need for scuffing the epoxy and this is found within the epoxy's recoat window. If done at the right time the bond strength is unbelievable. With most of the epoxies I have used the poly works best being applied over 12-24 hr old epoxy. Keep in mind these products are spec'd to be used in good temperatures and if it is cool some epoxies go dormant and may never cure properly, some polyesters will also stop curing if cool. Film thickness also plays into how fast the epoxy cures- two coats takes longer to cure than one coat. I like two coats of epoxy over bare metal for my base primer.
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