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.
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
1. Primer—apply Sher-Wood Kem Aqua
Plus Surfacer at 4-5 mils wet. Air dry
thoroughly. Sand with 240 grit sandpaper.
A second coat of primer may be
applied for improved holdout. Sand
between primer coats and before topcoat.
2. Topcoat—apply Sher-Wood Kem Aqua
Plus White at 3-4 mils wet. A second
coat may be applied. Sand with 240
grit sandpaper between coats.
3. A coat of Kem Aqua Plus Clears can
be used a final coat for added performance
4. Dry—allow overnight drying before
stacking or packing
5. Maximum dry film thickness of the
system should not exceed 4 mils.
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
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