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HVLP Advice

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Blog entry by DocK16 posted 02-09-2015 01:51 AM 990 reads 0 times favorited 3 comments Add to Favorites Watch

I picked up a Fuji HVLP sprayer a couple years ago at an auction thinking I would need it someday; well that day has come, I need to spray 35 kitchen doors and drawers and I must profess my ignorance on where to start. I want to spray varnish (not water base) with it but I have a few questions. Can you spray polyurethane with an HVLP gun? If yes how much does it have to be thinned and what kind/size spray tip do you need. Any knowledgeable advice would be greatly appreciated.

-- Common sense is so rare anymore when you do see it, it looks like pure genius.



3 comments so far

View firefighterontheside's profile (online now)

firefighterontheside

13450 posts in 1318 days


#1 posted 02-09-2015 02:03 AM

With my Earlex I use a 1.5 needle. I doubt that you will need to thin the polyurethane, but you can. Probably no more than 10%. It does a great job at spraying poly. Just need to practice on some scrap wood to get the technique down. It’s easy to get runs if you put too much product on.

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

View Bigrock's profile

Bigrock

290 posts in 2424 days


#2 posted 02-09-2015 03:41 AM

Hi:
Yes, but use as small amount of oil (liquid) as you can when spraying. HPLV guns will do nicely if you cut back on the amount of liquid you spray. I said that twice on purpose.
Rind a wooden box and learn to spray that until you learn to spray without runs or the back of cabinets. There is a learning curve. You should be OK with a 1.2 or 1.5 needle. I hope you have a three stage unit.
Water needs a larger needle.

View Arthouse's profile

Arthouse

250 posts in 2112 days


#3 posted 02-09-2015 11:54 PM

My advice is to stay away from any poly. It is so hard to use for drying time , dust sticks and it will color the wood darker. I use a laquer or a conversion varnish. They dry in five minutes and can take another coat in ten . You can spray ten coats on in one day. Poly has so many elements it does not dry and flow . As far as a HVLP is concerned take the air flow and fluid level down to zero then start opening them up on a piece of cardboard to get your right flow. If you use poly alway thin it is too thick for a good coat to dry. Always spray as little as possible on the first coat to let absorb second don’t sand until after the second coat. All this and Heaven too.

-- "The hand is the cutting edge of the mind but the wind and sun are the healing factors of the heart

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