Drill a shouldered hole to accept the tip that comes with them and press three times. The bottles are self metered.
Best I've found when it comes to ease of use, well worth the extra $$.
Or, go pneumatic!

www.xr650r.us/cannon/
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yeah it does, look at all the flammable ingredients: Denatured alcohol, butane HFC 152A, isopropyl MyristateHitler_the_spud wrote:axe dosent work either jnoiw by the way