thinning polyurethane

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Forum topic by Jeff Murdock posted 10-22-2011 03:26 AM 11351 views 1 time favorited 4 replies Add to Favorites Watch
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Jeff Murdock

3 posts in 2460 days

10-22-2011 03:26 AM

Topic tags/keywords: resource

It has been suggested to thin or cut Minwax polyurethane so it will go on easier. How much should I cut it and with what? Mineral spirits or paint thinner?

-- Jeff, McDonough, GA

4 replies so far

View gfadvm's profile


14940 posts in 2717 days

#1 posted 10-22-2011 04:14 AM

I use 1 part mineral spirits to 3 to 4 parts poly (I also really like this mix to wipe on Spar urethane as it has a less ‘plastic’ look to me).

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View Fred Hargis's profile

Fred Hargis

4999 posts in 2520 days

#2 posted 10-22-2011 01:55 PM

Paint thinner should be cheaper, but they both do the same thing for thinning.

-- Our village hasn't lost it's idiot, he was elected to congress.

View nailbanger2's profile


1041 posts in 3170 days

#3 posted 10-22-2011 02:44 PM

The main ingredient in paint thinner is mineral spirits. A half and half mixture will give you wipe on poly. Dries in two hours, but you’ll need more coats.

-- Wish I were Norm's Nephew

View Fuzzy's profile


298 posts in 4015 days

#4 posted 10-23-2011 04:25 AM

I don’t use Minwax if I can help it, but I use VM&P Naptha to thin poly and Waterlox, and the first several coats I use about 70-75% Naptha to 25-30% finish. It drastically reduces surface tension and allows the finish to seep deep into the pores of the wood.

-- - dabbling in sarcasm is foolish … if you’re not proficient at it, you end up looking stupid … ... ...

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