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Old 01-31-2012, 07:38 PM   #1
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Wood reaction to waterbased varnish


Hi People

I thought I would give a shout out for advice, This is the second time I try water based varnish (crystal) on pine. Both times what has happened is some of the wood grain swells on the first coat.

This time I was doing a simple piece of plywood, one side finished, I pre sanded down the board with 220, and applied the first coat in my basement at 20 degC. Some of the wood grains bloated and became rough, which I sanded a bit before going for a second coat. I am lucky both jobs did not need a perfect finish because it really should have been sanded way more and in risk of removing all the varnish thus causing the same issue again on a re-coat. Its like the wood is too dry in places.

I am just a hobiest, but I was wondering how you more experienced guys get around this? Do you sand down the first coat all the way down? because leaving some of the wood grain lifted can't be acceptable on a pro job? or is this common for water based?

Hope I made sense, thanks in advance
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Old 01-31-2012, 07:47 PM   #2
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Wood reaction to waterbased varnish


Sure is, go with an oil based and it will not raise the grain.

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Old 01-31-2012, 08:08 PM   #3
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Wood reaction to waterbased varnish


Thanks for the quick reply

I have issues with the smell and VOCs in my house, this is why I go for the water based. So the million dollar question is how to do the best job possible?

Thanks
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Old 02-01-2012, 04:58 PM   #4
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Wood reaction to waterbased varnish


It says right on the can of most water based products that it will raise the grain. Either use a stinky sanding sealer, then your water based varnish or live with lightly sanding after your first coat and then applying more coats. First coats usually need light sanding no matter what finish you are using if you want a smooth final coat. I use 320 or 400 grit between all coats until the final one.
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Old 02-02-2012, 08:23 AM   #5
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Wood reaction to waterbased varnish


Understood
I will work around it, at least I am not doing it wrong.

Thanks again
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