blocking?

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jlwdvm

Member
I sprayed on a guide coat 1 day after I sprayed a fresh coat of white epoxy and started blocking. I am using 120 (thought 80 would remove too much epoxy). It seems like I am having to sand quite a bit to get the guide coat off and the epoxy has a little bit of a "dirty" look to it after I hit it with compressed air. Is this normal for 12o and a light coat of spray-on guide coat. It's my first time blocking....any other tips? Thanks.
 
jlwdvm;17989 said:
I sprayed on a guide coat 1 day after I sprayed a fresh coat of white epoxy and started blocking. I am using 120 (thought 80 would remove too much epoxy). It seems like I am having to sand quite a bit to get the guide coat off and the epoxy has a little bit of a "dirty" look to it after I hit it with compressed air. Is this normal for 12o and a light coat of spray-on guide coat. It's my first time blocking....any other tips? Thanks.
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How old is this epoxy? Is it sticking to your paper? 120 should sand your guide coat off pretty fast. What did you use for guidecoat? I just use a different color of epoxy.
 
I have found that a minimum of 24 hours at 70 degrees is usually required before my epoxy sands decent. If I get on it too soon it will gum up the paper.
Also, I rarely need guide coat on epoxy primer. It acts as its own guide coat when block sanding since the sanded parts will have a different shade (lack of gloss) to them. Then again I use black epoxy the majority of the time so maybe the white is different.
 
I have already had it load up the paper after 3 days. It is all about temperature. I have also baked the epoxy in the sun and it sanded perfect in less than 10 hours.
 
there's blocking then there's surfacing . i consider 100 my last blocking grit. by then i am done. from there it is another good coat then start surfacing. think of sanding like drilling a hole in steel. you drill a small hole then step up a size or 2 and it goes much faster. i use all the grits because it makes it faster. 180/220/320/400/600 and i'm ready to seal.
 
jlwdvm;17989 said:
Is this normal for 12o and a light coat of spray-on guide coat. It's my first time blocking.
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Do you have a picture of your idea of a light coat of guide coat, and what did you use?
 
I can't remember the name of the spray-on guide coat, but it was recommended by my friend at the automotive paint supply store. The car got a light misting of the coat, similar to what I have seen other people do. I waited almost 4 days to start sanding. The paper doesn't gum up with epoxy. Didn't know if what I am seeing is black dust getting into sanding scratches that gives the white epoxy a dirty look that will come off when I clean the panels with w&g remover.
 
jlwdvm;17997 said:
Didn't know if what I am seeing is black dust getting into sanding scratches that gives the white epoxy a dirty look that will come off when I clean the panels with w&g remover.
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Try wiping it off and see. If that is the case, you would be way better just going by the gloss of the epoxy (like coronet said). If you are a beginner, I would recommend guide coat though. The easiest thing is to just mix a little epoxy of a different color right after you finish spraying and use that. I dont clean the cup or the gun or anything... just mix it and spray it on when the gun is still dirty. Then its all the same materal and there is no possiblility for contamination with using other products.
 
i've all but stopped using guide coat. the gray epoxy really does not need it. epoxy block.jpg
 
Thats the way I feel about the black! Here lately the crazy thing is that 2k has been loading my paper more than the epoxy..... You would think it should be the other way around!
 
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