Viscosity cup - Thinning latex paint

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Forum topic by dakremer posted 10-04-2015 11:43 PM 1224 views 0 times favorited 2 replies Add to Favorites Watch
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2730 posts in 3241 days

10-04-2015 11:43 PM

So am I missing something?....

So I finally bought a viscosity cup to help get better/more consistent results thinning my latex paint to shoot it through my Woodriver Pro HVLP sprayer.

Lots of forums I read say to thin the paint by roughly 10%, or that the viscosity cup should be 120secs or less (give or take)....

I put a little bit of Floetrol in the paint, and then thinned it with water by about 5-10%. It only took the paint 48 seconds to empty from the viscosity cup.

Based on the number (48 seconds) it seems like its thinned pretty well. However, it seems way thicker than what I HAVE been putting in my gun with great results. With a 2.0 needle, my gun would not spray this very nicely – its too thick

Can anyone shed some light on this subject for me? Is it okay that the paint flows through the viscosity cup within 50 seconds?

Maybe I’m over thinking it. haha

-- Hey you dang woodchucks, quit chucking my wood!!!!

2 replies so far

View lew's profile


12333 posts in 3905 days

#1 posted 10-04-2015 11:47 PM

Maybe I’m just lucky (which I doubt) but I thin latex with water so that it empties the cup in about 50-60 seconds. I have a really cheap HF gravity feed gun (purple). Mine’s not HVLP so that might make a difference.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View firefighterontheside's profile


19093 posts in 2006 days

#2 posted 10-04-2015 11:49 PM

I think it’s ok that it flows thru. One thing I’ve been told about latex is that you need to break up the long chains of latex by using a paint stirrer in a drill. That may make for better results. I have had ok results with spraying latex, but I don’t like it. I’ve had better luck with tinted lacquer. Just thinned it with water a bit and had professional looking results.

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

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