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Final Coat of Polyurethane

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Forum topic by tommyc325 posted 05-06-2016 02:04 AM 594 views 1 time favorited 12 replies Add to Favorites Watch
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tommyc325

54 posts in 819 days


05-06-2016 02:04 AM

Hi Everyone

I about 4 hours ago I applied my third coat of polyurethane to a walnut table top I made. After each coat I sanded down and vacuumed with 220 grit. Now that my third coat is dry I noticed there’s some air bubbles and some ruff spots that I would normally sand down but I wasn’t sure if I should sand this final coat.

My question to you is what do you suggest I can do for this final coat to get this table super smooth and keep the look that it has.

Thank You In Advanced.

Tom


12 replies so far

View Woodchuck2010's profile

Woodchuck2010

508 posts in 321 days


#1 posted 05-06-2016 02:32 AM

I’d say the final coat is the last one you apply. Sand it and apply another coat if you’re not happy with the finish.

-- Chuck, Michigan,

View conifur's profile

conifur

955 posts in 614 days


#2 posted 05-06-2016 03:04 AM

Well gives a hint, what are you using for a finish, oil, or water base?? How are you applying it???
Another freaking post, I want answers but not enough info!!! My Rant
Vacuumed, you should have wiped it down with a damp cloth with many different things, water, mineral sperits, Naphtha, ect.

-- Knowledge and experience equals Wisdom, Michael Frankowski

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tommyc325

54 posts in 819 days


#3 posted 05-06-2016 03:06 AM

Fast Drying Semi Gloss Poly Oil
Foam Roller

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conifur

955 posts in 614 days


#4 posted 05-06-2016 03:14 AM

I never used it or applied that way, I bet the the combo is putting air bubbles in it and b4 they can air out, the Poly sets up. I would lightly sand them out, then use the Poly and cut it with Mineral Spirits, 50/50 and wipe it on for your final coat.

-- Knowledge and experience equals Wisdom, Michael Frankowski

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conifur

955 posts in 614 days


#5 posted 05-06-2016 03:21 AM

Also never shake a can of finish to mix, stir it, shaking puts air bubbles in it.

-- Knowledge and experience equals Wisdom, Michael Frankowski

View tommyc325's profile

tommyc325

54 posts in 819 days


#6 posted 05-06-2016 03:22 AM



Also never shake a can of finish to mix, stir it, shaking puts air bubbles in it.

- conifur

I didnt shake the can

View WhoMe's profile

WhoMe

1465 posts in 2706 days


#7 posted 05-06-2016 03:32 AM

I usually avoid foam rollers, brushes, they have a tendency to make bubbles. That has been my experience. And the fast drying poly might be drying too fast for the finish to flow out and may trap any bubbles.
If you can sand out the bubbles do that and if you can thin the last coat, that may help prevent any possible bubbles that the foam roller may cause. Also, I usually sand with 320 on the last couple coats.
Just some suggestions.

-- I'm not clumsy.. It's just the floor hates me, the tables and chairs are bullies, the wall gets in the way AAANNNDDD table saws BITE my fingers!!!.. - Mike -

View BurlyBob's profile

BurlyBob

3674 posts in 1728 days


#8 posted 05-06-2016 03:35 AM

Let it dry hard, real hard. Give it a light sanding with 600 grit wet dry paper. Thin the poly down super thin. Get a piece of polyester cloth and fold so you get a 3-4 inch fold. Dip in the thin poly and use the fold as a squeegee to move the poly along the table top. If you can look across the top from the side you can see where you need to apply the varnish to give it complete coverage.

I’ve used this method for years and have been able to achieve extremely smooth finishes. I’ve also put the fold inside a piece of pantyhose to prevent lint in the finish.

Best of luck.

View RogerM's profile

RogerM

761 posts in 1862 days


#9 posted 05-06-2016 02:33 PM

Your poly is too thick. Dilute with an equal part of mineral spirits and put on another coat.

-- Roger M, Aiken, SC

View distrbd's profile

distrbd

2227 posts in 1909 days


#10 posted 05-06-2016 02:41 PM


Get a piece of polyester cloth and fold so you get a 3-4 inch fold. Dip in the thin poly and use the fold as a squeegee to move the poly along the table top.

- BurlyBob


Never tried it that way,thanks burlyBob.

-- Ken from Ontario, Canada

View AWood's profile

AWood

49 posts in 3209 days


#11 posted 05-06-2016 03:14 PM

Lightly sprinkle water on finish and lightly sand with 440 grit; wipe dry with damp cloth; apply a light brush finish of poly urethane and immediately go over with brush application with sponge.

-- AllWood

View pintodeluxe's profile

pintodeluxe

4854 posts in 2276 days


#12 posted 05-06-2016 03:20 PM

I agree with others to wet sand once fully cured. I use a spray bottle of tap water and a 1500 grit soft sanding sponge.

Applying poly with a roller would be the cause of the problem.

Hope it comes out okay.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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