Getting the bumps out of a finish - Woodworking Talk - Woodworkers Forum
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post #1 of 4 Old 01-26-2010, 08:00 PM Thread Starter
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Getting the bumps out of a finish

I made an outdoor sign and used to an outdoor poly to finish it. I've put a few coats on it and I started see it a bunch of little bumps in it. I want a glossy finish so I need quite a few coats. Can I keep putting coats on until the end and then sand it out to make it smooth or do I have to sand in between each coat? I've already put a few coats on. Also, how do I go about buffing it to give it a real glass like finish? Thanks a lot
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post #2 of 4 Old 01-26-2010, 11:04 PM
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What finish are you using RG? I have a hunch you got a little overzealous and put too much on too fast. You may be better off at this point to let it dry thouroghly and sand it back to smooth and start over putting thin coats on and scuffing between coats. I have also seen finish do this when applied in direct sunlight. The instructions on the container may give you a hint to where you went astray.

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post #3 of 4 Old 01-27-2010, 01:23 AM Thread Starter
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yeah i probably did get a little carried away with how much I was putting on. Once that's done, any idea on how to buff it to make it like glass?
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post #4 of 4 Old 01-27-2010, 07:19 PM
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The only thing that makes each new coat of poly adhere to the last coat is sanding. It is called a mechanical bond. If you have been letting it dry and then applying the next coat without sanding you stand good chance of having some layers just peel off.

Last edited by Rick Mosher; 01-28-2010 at 03:34 PM.
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