Posted on August 1, 2022March 24, 2023 by Dale Phillips Spray Gun Agitator Spray Gun Agitator by Jimmie Van Originally published in Guild of American Luthiers Data Sheet #91, 1978 A new product that I found to be most helpful when spraying a finish or other things that had to be in complete suspension to assure uniform coverage, is a agitator siphon cup assemble sold by N.A.P.A. auto part stores. This cup will work on most major brand guns. The 1 quart cup provides constant agitation from air right off of the same line that your gun works off of, no extra line is needed. You can control the mixing speeds of the agitator, and does not require an extra cleaning. The part number you need to ask for is model 70-707. This may be of big help to those of you who do a lot of finishing work.