Wet blocking with 400 grit.

Toolin

Toolin

Promoted Users
Picked up some Super Flex Wet/Dry PSA 400 grit for blocking prior to single stage. I would have bought some Oslong Abrasives L338 Sanding Film. I think it may be discontinued because you can only get it in a handful of grit sizes. Many are out of stock. Anyway I am first using it today on a deck lid with two coats of unreduced white epoxy. It has had only had a day to cure so maybe that is the problem I am having with the paper plugging. I think this is bad because I believe it will compromise the surface.
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My experience is one day on 2 coats is not enough cure time. I prep all of my golf cart bodies with epoxy(3-4 coats) depending on the shape of them and I try to get them all in the sun for a day or 2 to bake. Any less than that it will clog up when sanding and sometimes even pull away from the surface.
 
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I wait at a minimum, 48 hours before sanding epoxy once sprayed. Even then I'll pick up some paint boogers. I've found not putting pressure on the sanding blocks, and letting the paper do the work, allows the boogers to be blown off with compressed air.
 
dhutton01 said:
It’s really not necessary to 400 wet sand prior to single stage imho. You are making things difficult for yourself. If it is a solid color single stage it will easily fill 320 scratches. It’s not the same as spraying base….
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I have also heard that from others. Either way I think I'll give it at least another day. I thought using 600 may lesson reducing mil thickness.
 
Toolin said:
I have also heard that from others. Either way I think I'll give it at least another day. I thought using 600 may lesson reducing mil thickness.
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Generally all you’re doing with 600 is refining the 400 scratches so you’re not really removing a lot of material. I would not mess with 600 with a solid color single stage.

Insert mandatory backyard hack disclaimer here…. ;)

Don
 
Toolin said:
I thought using 600 may lesson reducing mil thickness.
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Don, I misspoke when I said 600. I meant to say 400
I have some Indasa 320 Rhinodry PSA. Can I assume dry sanding W/320 is fine for final sanding before single stage?
 
Toolin said:
Don, I misspoke when I said 600. I meant to say 400
I have some Indasa 320 Rhinodry PSA. Can I assume dry sanding W/320 is fine for final sanding before single stage?
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It would likely be fine. I usually do 320 dry followed by a quick pass with 400 dry. Then epoxy reduced as a sealer followed by single stage.

Sorry if I’m screwing up you plans here. Just trying to save you some time and effort.

There are a lot of ways to do this, just relaying what has worked for me.

Don
 
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I have the decklid blocked in 320 and again I have cut thru the 2k to poly primer. About 10% of the panel has 2K and poly showing. The the remainder is all the epoxy. So I want to do a quick shoot with more epoxy. What reduction ratio and coats would is sufficient to prevent any mapping and adequate mil thickness for a quick blocking with to 400 prior to single stage?
 
I would sand with 400 and then just shoot 50% reduced epoxy as a sealer and proceed to single stage same day. No additional sanding necessary imho. I have done it that way many times.

Don
 
Thanks, I plan on getting the hood to the same point as the decklid is now and proceed as suggested on both panels in a single session. The backside of the deck lid it's already in single stage. I only plan to cut and buff the exterior sides of the panels. Would either of you mask the undersides?
 
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