I made a large table out of maple plywood edged with maple. It is to be painted black so this morning I took it outside and sprayed it with two coats of black pigmented WB acrylic. I left it outside all afternoon to dry and it was in the sun for a couple hours. It was hot today over 100 degrees here in AZ. When I checked on it the finish looks fine but in a couple places it looks like the top layer of maple has separated from the second layer of wood in the plywood and formed bubbles. They range in size from less then a dime to about the size of a quarter and are oval shape running with the grain. I am thinking all I could do is chisel or sand out the bubbles, fill the resulting voids with bondo, sand and then repaint. Any other ideas?
Thanks
Replies
markt,
You could try slitting the bubbles with a razor and injecting some glue in and then clamping. I have done this numerous times for veneer repairs and it works for me.
J.P.
I had a similar problem last year with a paint grade fireplace mantle. I think that the water based paint caused the bubbles when it moistened areas of the veneer that weren't adhered well.
I did the patch and sand thing, but the repair was still visible if the lighting was at the right angle. I finally just rebuilt it.
You could try what JP said. But, the glue under the rest of the veneer probably has been weakened and may separate later.
I can vouch that one should NEVER finish wood in the sun or let it cure in the sun! The first problem will be blisters in the finish caused by the heating and expansion of trapped air in the wood. 2nd problems will be as you observed, plus other glue joint failures. 3rd problems can be degradation of the applied finish, bleaching of stains, etc.
PlaneWood by Mike_in_Katy (maker of fine sawdust!)
PlaneWood
I guess I learned the hard way, I have finished outside before but never left anything in the sun. It probably didn't help that it's a black finish.
Thanks
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