epoxy as sealer over polyester primer

R

R2D2

New Member
Hi can I apply epoxy as a sealer over sanded polyester primer or do I need to use a 2K primer first?
 
Sure. But I spray a coat of 2k over the poly to fill in the scratches and then wet sand the 2k 400-600. No scratches to worry about cancelling out, then epoxy seal over that.
 
Lizer said:
Sure. But I spray a coat of 2k over the poly to fill in the scratches and then wet sand the 2k 400-600. No scratches to worry about cancelling out, then epoxy seal over that.
Click to expand...

I'm confused by this reply ^^^ .............if a person has sanded the polyester with 400-600, why would they need to spray 2k over the already sanded polyester to sand the 2k with 400-600?
 
MJM said:
I'm confused by this reply ^^^ .............if a person has sanded the polyester with 400-600, why would they need to spray 2k over the already sanded polyester to sand the 2k with 400-600?
Click to expand...
I doesn’t say anywhere poly is primed 400-600. Those are wet sanding grits and I would not be wet sanding poly primer.

Whether it’s urethane or poly, I block at 220 then always spray a coat of urethane to help fill in the scratches, and wet sand the urethane.
 
Last edited:
Lizer said:
I doesn’t say anywhere poly is primed 400-600. Those are wet sanding grits and I would not be wet sanding poly primer.

Whether it’s urethane or poly, I block at 220 then always spray a coat of urethane to help fill in the scratches, and wet sand the urethane.
Click to expand...

You're correct, the OP didn't state what sanding grit was used on the polyester primer. I assumed it would be somewhere between 400-600 grit because his question was can epoxy sealer be used on polyester primer. I would assume since he's asking about using epoxy as a sealer, he would't be spraying a sealer over course scratches.

Why can't you wet sand polyester primer?.......or are you saying that's your personal preference to not wet sand polyester primer?
 
Polyester primer is basically thin sprayable bondo, it will absorb moisture. Do you wet sand filler?
 
1A Rock said:
Polyester primer is basically thin sprayable bondo, it will absorb moisture. Do you wet sand filler?
Click to expand...

I would not wet sand filler, however........

Clausen Rust Defender Polyester Primer states their product is Water and Moisture proof and can be wet sanded.

"RUST DEFENDER Handling Instructions(Please read and follow all directions carefully)For Professional Use OnlyThis product is a one step finishing material from bare metal, body filler, wood, aluminum, or fiberglass to a surface ready to accept any type of paint without concern about penetration of solvents or moisture.

Over twenty years in development and testing by THE CLAUSEN COMPANY, this product is, by design, a different product from those currently marketed. The primary functions of this product are:1) 86% Solids 5) Wet sandable and waterproof2) Non-shrinking 6) Self-etching3) Easy sanding 7) 2.01 V.O.C.4) Excellent hold-put properties 8) Isocyanate – Free"
 
You must log in or register to reply here.
Back
Top