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Waterborne veneer bubbling2/28/16
I am spraying waterborne finishes and I am having problems with plywood. It seems like every job I have bubbles in the veneer or other defects show through after I spray. Also it seems to show the grain texture more dramatically than I remember from solvents. Are there any tricks I don't know about to help reduce this? The
Yep, raising the grain is one of the traits of waterborne. As for the bubbles in veneer, welcome to the state of modern plywood. Just experienced it with my door supplier. Half of my veneered panel doors rippled horribly when I applied a waterbased dye stain. They replaced them, but it set me back a week on that job. I've also seen it on various grades of sheet goods.
what material exactly are you spraying ?
more information about what and how you are spraying would help
The last time it was poplar veneer core plywood, supposed to be a good paint grade. The primer coat and other coats are fairly wet (heavy). We did let them dry properly. I may try MDO for the next paint grade job. If I did the seal coat in lighter passes would that help? I still need a nice wet top coat for the final coat.
yes lighter coats will help you. if its priming sand in between as if building a lacquer finish. MDO is pretty nice stuff.
maybe after a few coats of primer use some automotive glazzing putty to fill in cracks, this is not waterbase stuff so it wont swell the wood than continue building till you get the finish youre looking for.
i finish 95% of my stuff to a high automotive finish so my process may differ from yours.
also if you could tell me EXACTLY what product youre priming with i can give better direction. brand part number etc
Wood Finishing System
yes I would recommend going lighter than they are telling you here. I use automotive primer on my wood because it is not water based and does not swell the wood. but it does shrink when it dries so it pulls on the wood leaving it curved unless you prime both sides
do you have a wet mil gauge ?
If I've said it once, I've said it a hundred times; " if it is to be painted than it should be mdf or mdo whenever possible.