Hi, I'm trying to refinish a piece of wood here, and I've painted it black, and am now varnishing it with a gloss varnish. For some reason in the last few layers of varnish, I am getting strange lumps in it. It's almost like the sanding is making air bubbles to appear under the varnish when spraying it on. I am using a 400 grit sandpaper between layers, and getting those issues. The surface feels perfectly flat before varnishing, but those lumps keep appearing. Does anyone know why? (Hopefully you can see it in the image.)
20141103_161120.jpg
20141103_161120.jpg
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