does water based poly have problems with humidity?

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Forum topic by JesseTutt posted 05-30-2013 03:17 AM 3183 views 0 times favorited 4 replies Add to Favorites Watch
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854 posts in 2080 days

05-30-2013 03:17 AM

Topic tags/keywords: water based poly humidity and finishes

Usually I work with oil based finishes and will not spray in high humidity. I would like to spray water based poly tomorrow but the humidity will be high. Does water based finishes have the same temperature and humidity considerations as oil based?

-- Jesse, Saint Louis, Missouri

4 replies so far

View Finisherman's profile


227 posts in 1819 days

#1 posted 05-30-2013 03:31 AM

Waterborne products are even more sensitive to humidity than are their oil and solvent based counterparts. In very humid conditions, waterborne products dry very slowly, giving them more time to run, sag and collect dust. The ideal solution would entail the installation of a dehumidifier. Failing that, warm the room that you’re working in and be sure to create adequate air flow over the surface. Better yet, wait for a drier day to do your spraying, if at all possible.

View Earlextech's profile


1160 posts in 2660 days

#2 posted 05-30-2013 12:49 PM

Hi Jesse, I used waterborne in Florida for the last 25 years. Humidity never caused me any more problems than solvent based ever did. Turn on a fan blowing from behind you and across the project you’re finishing. This will reduce the humidity in the immediate area as well as push flying insects away from the wet finish. Waiting for a drier day was not an option for me, but if you don’t have a deadline maybe it is for you. See you soon Jesse!

-- Sam Hamory - The project is never finished until its "Finished"!

View firefighterontheside's profile


17976 posts in 1826 days

#3 posted 05-30-2013 01:10 PM

I concur. I live just south of St. Louis and I have not experienced any difference. It is true that when it is very humid things are gonna dry slower, but it should be the same for both. Just try to have a dust free environment.
I just got a new Earlex 5500 and intend to spray both finishes this summer. If you live in St. Louis you know the kind of humidity we have here. Hopefully we don’t have the drought and heat we had last year. I will trade some humidity to not have high of 108.

-- Bill M. "People change, walnut doesn't" by Gene.

View Clint Searl's profile

Clint Searl

1533 posts in 2331 days

#4 posted 05-30-2013 02:50 PM

I think I’d go with the advice from those with real experience.

-- Clint Searl....Ya can no more do what ya don't know how than ya can git back from where ya ain't been

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