The downside to most standard spray guns is that the bounce-back can be significant, sending excess finish airborne in your shop. Let George Vondriska show you why HVLP systems are the best way for the average woodworker to avoid spray gun bounce-back. A WoodWorkers Guild of America (WWGOA) original video.
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I don’t think that is a fair comparison. The spray settings for the conventional gun resulted in a too high pressure and material flow. Otherwise, the results would be the same.
There are advantages and disadvantages of both types of sprayers, mostly involving clean up. The conventional guns are more expensive and you can’t see when you are running low without opening it. The metal container is easier to clean when spraying oil-based enamel (thinned with lacquer thinner, NOT paint thinner or mineral spirits). There is always some material left in the sprayer container, hard to reach areas are more difficult and the spray head has to be spray-cleaned. The gravity-feed (GF) sprayers are cheap enough to have each one dedicated to spraying shellac, water-based acrylic (so-called “polyurethane”) and genuine oil-based polyurethane. You can spray until you empty the GF container, you can even spray upwards, there is a built-in particulate filter in the sprayer that is easy to clean and the sprayer head can be easily cleaned by just running the appropriate solvent (DNA, water or mineral spirits, respectively) through it by gravity without actually spraying it clean – you can hold the trigger down with a rubber band, capturing the waste in a container. But waste enamel is very difficult to clean out of the GF sprayer head and the plastic container.
I have a sealed room used for GF spraying. I never use it for spraying enamel due to the colored over-spray, preferring spraying enamel outdoors, weather permitting. But after spraying shellac, acrylic and especially polyurethane, there is a cloud of material in the room, so that there is always some over-spray to contend with.
I agree with you on that the conventional sprayer was set to high on the air pressure.. I am not an expert on spray guns by any means, but just listening to the gun told me the psi was way to high.
oh, and thanks for your tips on the GF guns.. I don’t have any at the moment and yes I know how difficult it is to clean an syphon type gun..
I don’t understand why one does the job better than the other. ?
Hello. HVLP systems apply the materials with lower pressure, which means less bounce-back. That gives you less mess and more efficient use of your finishing products.
Thanks
Paul-Woodworkers Guild of America