Water Based Sealer - Woodworking Talk - Woodworkers Forum
 
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post #1 of 4 Old 09-24-2015, 09:13 PM Thread Starter
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Water Based Sealer

Hey, this is my first post. I am new to woodwork, and am sealing painted woods (barnquilts specifically). I purchased a water-based, exterior, spar urethane, crystal clear. I can only find one video online showing application of water based sealer, and it's thinned 50/50, then 25/75 for the final coat. Is this a general practice?
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post #2 of 4 Old 09-26-2015, 10:28 PM
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if it's already painted, I don't see a need to seal the wood before topcoating. That said, if these are actually going on a barn, I'm not sure I'd use a water based urethane spar varnish. In fact, I'm not sure I see a need to varnish them at all; paint provides better protection than varnish can.
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post #3 of 4 Old 09-27-2015, 03:46 AM
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When you paint you have already sealed the wood. Now the question is how you prepped the wood and did you use a exterior paint.
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post #4 of 4 Old 09-28-2015, 06:32 AM Thread Starter
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Thanks so much for your help so far. I prepped the wood with weather resistant primer. One purpose for the sealer is not only to protect the wood under everything, but also to protect the paint from the sun; the sealer is UV resistant.

After talking with some women that use the same sealer on the same project, I have applied a coat, undiluted, with a high density foam roller. There are some visible, though very small, bubbles now that it is dry. I tried sanding them with a 0000 steel wool, but it's not seeming to smooth them out. Does this mean that I put too much of the sealer on, or that conditions were not ideal? I used a stir stick and did not shake the can before applying.
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exterior sealer, outdoor use, thinning, water based spar urethane

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