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Thinning Rustoleum Ultimate Polyurethane for HVLP spray application

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Forum topic by paxorion posted 01-12-2015 04:47 PM 4066 views 0 times favorited 10 replies Add to Favorites Watch
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paxorion

1102 posts in 1507 days


01-12-2015 04:47 PM

Topic tags/keywords: question hvlp finishing

I must be in the crowd that cries bollox when a top-coat finish says “DO NOT THIN”, despite the manufacturer selling an aerosol spray can version.

I am hoping to come up with a more inexpensive water-based polyurethane (not looking to use lacquers) to thin and spray than any of the GF water-based products or Minwax Polycrylic. I’ve used Rustoleum Ultimate Polyurethane and have found it to be a great topcoat thus far. It appears to be water-based (milky white color, dries clear, water cleanup), and I plan on trying a batch to thin and spray in my HVLP but wanted to know if anyone else has come up with the same idea thus far. If so, I’d love to hear about the experience and if there are any things I should know/try before I get to it.

-- paxorion


10 replies so far

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Hammerthumb

2532 posts in 1437 days


#1 posted 01-12-2015 11:48 PM

I spray waterbased polyurethane but have never had to thin it. Never tried Rustoleum though. I would give it a shot without thinning.

-- Paul, Las Vegas

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OSU55

1056 posts in 1451 days


#2 posted 01-13-2015 01:24 AM

I spray waterborne polyurethane, target coatings EM 9000. I have thinned it with up to 10% water. I find the extender that target cells to be the best thing to use.it really does not need to be thinned. I believe general finishes cells and extender for their waterborne finishes as well. Any of them can be there in 5 to 10% with water.The best thing to do is get a Ford or zahns cup to determine Viscosity and then select the correct spray tip for your gun.

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Scomel Basses

169 posts in 1459 days


#3 posted 01-13-2015 04:09 AM

I have sprayed the Varathane water poly for floors you can get at lowes. It has been great. I prefer GF’s Enduro Var for the instruments I build because it has an oil-like amber effect but it’s a lot more expensive. I’ve never thinned either product and use a Fuji Mini Mite 4.

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Earlextech

1159 posts in 2152 days


#4 posted 01-13-2015 02:09 PM

“DO NOT THIN” are lawyers words, not woodworkers. If you need to thin, up to 10%, to make the product work for you, then you do it. Because the manufacturer and the lawyers aren’t there when your finish isn’t laying out correctly!

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

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hotbyte

841 posts in 2437 days


#5 posted 01-13-2015 02:26 PM

I recently sprayed some that Rustoleum product with great results and did not thin. I have the Earlex 5500 sprayer.

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paxorion

1102 posts in 1507 days


#6 posted 01-13-2015 03:32 PM


“DO NOT THIN” are lawyers words, not woodworkers. If you need to thin, up to 10%, to make the product work for you, then you do it. Because the manufacturer and the lawyers aren t there when your finish isn t laying out correctly!

- Earlextech

Yep, I agree that its “our guarantees/promises are voided if you deviate from our instructions” language. Thanks.


I recently sprayed some that Rustoleum product with great results and did not thin. I have the Earlex 5500 sprayer.

- hotbyte

Interesting, so when you sprayed Rustoleum Ultimate Polyurethane, did you have to thin it?

-- paxorion

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RRBOU

136 posts in 1754 days


#7 posted 01-13-2015 03:54 PM


“DO NOT THIN” are lawyers words, not woodworkers. If you need to thin, up to 10%, to make the product work for you, then you do it. Because the manufacturer and the lawyers aren t there when your finish isn t laying out correctly!

- Earlextech

Yep, I agree that its “our guarantees/promises are voided if you deviate from our instructions” language. Thanks.

I recently sprayed some that Rustoleum product with great results and did not thin. I have the Earlex 5500 sprayer.

- hotbyte

Interesting, so when you sprayed Rustoleum Ultimate Polyurethane, did you have to thin it?

- paxorion

I have sprayed it and did not thin it. I have sprayed gloss satin and mat. So far I really like it.

-- If guns cause crime all of mine are defective Randy

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hotbyte

841 posts in 2437 days


#8 posted 01-13-2015 04:33 PM

Interesting, so when you sprayed Rustoleum Ultimate Polyurethane, did you have to thin it?

- paxorion

Nope, I just poured through strainer. I’ll try to check to be sure it was the “Ultimate” version.

View Fred Hargis's profile

Fred Hargis

3933 posts in 1955 days


#9 posted 01-13-2015 06:20 PM

While I agree that “do not thin” is a CYA driven by the EPA and the companies lawyers, I only see that applying to solvent finishes. With a waterborne finish you can thin it too much and throw the chemistry out of balance, so with them I think it pays to follow the manufacturer’s guidelines, most of them allow a little thinning…the 10% number seems to be a fairly common one.

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

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hotbyte

841 posts in 2437 days


#10 posted 01-14-2015 12:00 AM

I checked can and it is the “Ultimate Polyurethane.” I used the 1.5 tip with it.

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