How come when I use bondo or the fiberglass bondo no matter how long I let it set up after spreading the first go over with the sander clogs and globs up on the paper? I've tried everything. Short set up time, long time, over night. Hot, cold. I've gotten to the point now of accepting it and running the first paper over it knocking the top layer off, letting it set for a little while and then going back and sanding it again with new paper. Pain in the a$$.
What am I doing wrong.

well there could be a couple things that can make this happen. Not mixing right..like to much hardener, not enuff hardener, old material, moisture but more then likely its your mixing ratio is not right.

its not you its the wax thats mixed in with it making it stick to the paper..if it really bothers you that bad use a cheese grader over it just after it sets then wwhen it comes time to clean the cheese grader run a wire wheel over it to clean it..i like to use the half round ones,299a

http://www.azautobodysupply.com/chgrharoforb.html

Hummm..
You say wax...... I like to use old 12 pac soda boxes to mix on.....

you may want to try mixing it better or verifying the ratios your doing , never have a problem with Bondo or glass always hard as nails just gelcoat the first .003 is always tacky even using wax paper .. good luck












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I had the same problem last winter working on mine, I got to the point of having a wire brush in my pocket, a couple swipes over the sand paper and its ready to go again, my 2 cents

Bondo and Sandpaper















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Standard Bondo is a polyester based product and air will inhibit it's cure. Just like gelcoat, if you want it to fully cure add wax to it or coat it with wax.

that tacky layer is what will let further layers stick to it so well. The thin uncured layer of bondo will cure when more bondo is added on top, just like polyester resin or gelcoat. All of those will gum up paper until the top layer is sanded off. You are not doing anything wrong, it is just the nature of the product.

You could probably spray green seal over it to shield the air from it allowing for a full cure? Seems hard compared to a wire brush or a few pieces of bondo. Allways been that way, but not sure if they have a waxed version now or not.

Brian

Okay now I understand.
One of the ways I deal with it is to use my air compressor with a little nozzle and just blow the stuff that sticks to the paper off. Works to a point but still is a pain but I guess the pain I'll have to deal with.

Wipe it with acetone or Lacquer thinner first.