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Crevasses/gaps in polyurethane table top

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Forum topic by Schnurrwood posted 10-09-2018 12:16 AM 459 views 0 times favorited 2 replies Add to Favorites Watch
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Schnurrwood

1 post in 285 days


10-09-2018 12:16 AM

Topic tags/keywords: table wood polyurethane top coat finish poly table top

I just laid down my 7th coat of oil base polyurethane (applied with a brush) on a dinning room table made from 1×6’s of solid oak. I mistakenly didn’t put wood filler in the tiny cracks between the boards before finishing and still have crevasses in a few spots of my top coat (I have pics, but don’t know how to upload them).Can I thin my poly with mineral spirits, and use the homemade wipe-on poly to only fill the crevasses or will this make the table uneven?


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squazo

124 posts in 2065 days


#1 posted 10-09-2018 01:33 AM

I would think thinning it would just make it take more coats to fill it in. Id say just keep going un thinned and sand it flat eventually.

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Sark

135 posts in 780 days


#2 posted 10-23-2018 07:10 PM

I’ve had bad luck with too many coats of polyurethane, mainly because I did not allow enough time between recoating. Hopefully you did, because if you didn’t allow enough time, the poly may still be soft and gummy inside though dry to the fingers. If you wiped on and wiped off the finish, it may be that the finish is quite dry all the way through since wiping finishes go on thin. Spray finishes are somewhere in between. Did you sand between each of these coats? If so, then your finish is probably dry all the way through.

I wouldn’t add more coats without sanding it down. It’s quite possible to fill cracks with finish alone, and this is the historic way of doing it with shellac/pumice and rottenstone. Paste wood fillers definitely speed things up if the cracks are big. But the process is the same. Fill, sand, coat, finish, sand, fill, finish, sand…etc until all the voids are filled and the top looks the way you want.

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