Reply by tom427cid

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Posted on Question on Purchase of Finish Sprayer

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294 posts in 2954 days

#1 posted 10-08-2011 06:55 AM

Hi all,
If I may; I have been using spray equipment for a while. There are a couple of things that one can do to get a professional spray finish. First hp is not the necessary qualification for a compressor.It is cfm. Cubic Feet of Air per Minit. If you use a spray(syphon style)gun the most important qualification is again air consumption. Most older DeVilbis guns are about 7cfm. Sharps on the other hand sometimes range toward 11cfm. Years ago I converted a syphon style spray gun to pressureize the cup.The hardest piece to find is the flow-through bleeder regulator. This allows pressure to go to the gun and also to bleed off pressure to go to the cup.A word of caution here,DO NOT excede 8-9psi to the cup.I normally set my cup pressure to about 4psi. I put the regulator on the gun and use a piece of nylon tubing(1/4”) to pressurize the cup. Sometimes you need to drill and tap the cover of the cup to accept a fitting. What you have just done is to create what is reffered to as a modified HVLP. With this type of set up I spray laquer thinned 15-20%@ 7-10psi. I do give up a bit of fan width but I minimize the overspray.I have sprayed polyurethane and other types of finish with good results.Older good quality guns can be found for not to much $.
One other trick that can be done with the small airless hobby unit,Thomas is one brand that comes to mind, is to add a 1-2 gallon header tank. I once did a set up with two airless compressors,a header tank and the gun that came with the compressor. I couldn’t do a table top but it did work quite well for most other projects.
Hope this helps.

-- "certified sawdust maker"

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