Spitting usually comes from powder fused onto worn pump throats, hoses or the gun deflector, called impact fusion, which builds up and then breaks loose. Damp powder, too many fines, kinked hoses and low air also cause it. The result is blobs that cure as raised dots or runs. Fixes are cleaning or replacing wear parts, checking air, and cutting fines in the reclaim.
Gun three is spitting again, pull the venturi insert, I bet it's coated with fused powder.
Also heard as
- spits
Related terms
Fines
The smallest particles in a powder, roughly under 10 microns, which fluidize, charge and recycle poorly.
Feed hopper
The fluidized container that holds powder and supplies it to the gun pumps.
Trash
Floor word for dirt, lint, fibers and debris cured into the finish as bumps.
Seeds
Small hard lumps in the cured film from gelled or fused bits of powder rather than outside dirt.