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"Spitting" is a generic term used to describe any thing abnormal with a spray gun. If you are getting drops of water on the surface then you know that water is the problem. If you are getting little globs of paint, then you have lumps in the paint and this must be strained out. They are caused by paint that has settled out and not mixed very well. Try putting it in an electric or pnuematic paint shaker for several minutes. Always strain paint and primer as it is poured in the gun. And one very important thing: MAKE SURE THAT GUN IS CLEAN INSIDE. And not just in the cup. Gravity fed guns have a little filter in the delivery tube just under the cup. Unscrew the cup and remove the filter and soak it in laquer thinner to disolve any build up. Use laquer thinner, a cloth and a piece of splintered off paint stick the clean the tube where the filter sets. Remove the air cap and wash it out and wip off the fluid tip. Squeeze the handle and look inside the fuild tip. If you see a build of of materials then remove the needle and fluid tip and clean that area as best you can with wooden splinter and thinner. The sealing washer under the the fluid tip can be damaged easily so be careful. If you are using a syphon fed gun, this sealing ring can give way and cause a spitting that sounds like a machine gun. Rapid spitting/hissing with little or no materials delevered to the fluid tip. Be very careful in what you do. Any nicks or deformity of the working parts of the gun can ruin it.
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