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I’m using an HVLP system to shoot water base poly in a room thats about 12 x 24 feet. The room has one small window into which I placed a regular house-style window fan to exhaust the overspray. IT AIN’T WORKIN’!! I get overspray settling on every horizontal surface I’ve sprayed. Short of buying a $10,000 spray booth what can any of you guys suggest?
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Replies
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When I see pros spraying the inside of a house I see everything taped and masked off - even when HVLP equipment is being used. My suggestion would be paint brushes and/or rollers.
*I guess I wasn't too clear in my question. I'm not spraying the room, I'm spraying cabinets and furniture in this room !! This is my "finishing room".
*No way a window fan in a small window will ever properly exhaust paint spray. Jeff Jewitt's book "Great Wood Finishes" has the plans for a foldable, portable spray booth. Michael Dresdner's book "THe New Wood Finishing Book" also has a similar booth.
*A portable spray booth would be good, I finish in a 20X20 room without a spray booth and installed an industrial fan(about $150) in one wall and it sucks the overspray pretty good, although I haven't tried water based. I use Shellac and Lacquer and don't have any problems. I also use a good mask for lung protection.
*Thanks for the info. I'm going to try your spray booth idea. I have a 'squirrel cage' type fan I'm going to try to adapt to exhaust the overspray.
*My spray situation is exactly like yours. I curtained off my spray area with a tarp and bought an 18" fan that is often used in livestock barns. Aside from overspray in the spray area I have no problems except that I must open another window close by since the suction of this fan wiil create a downdraft in my chiminey. Dust from the basement ceiling is also a problem, i'll get around to putting plastic there.
*I work in a garage and I cover what I don't want to get that stuff on. No matter how much you try there is always some in the air. And over the series of coats all surfaces should be covered. Unless you have a room where the overspray is completely sucked out.
*Although it is unlikely, there is a possibility of explosion if you use an exhaust fan not designed for paint booth duty, particularly with nitrocellulose lacquer. The fan should have a non sparking impeller, aluminum, bronze or plastic, be direct drive with a TEFC explosion proof motor or have the motor outside the airstream.
*Since I've noticed you seem concerned with the surfaces you've sprayed and not secondary overspray in the finish room I would suggest a lacquer retarder. This will allow the lacquer more time to settle into itself. Do they make retarder for WB lacqer? I don't know. I spray nitro and cats. There will be some overspray inside cabinets which you can just knock down (lightly)with worn 3M extra fine pads or worn scuffing paper. Try less thinner too.
*Beleive me, squirrel cages don't work. I use an old air conditioner fan with great results.
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