TROUBLE SHOOTING
Ask@SprayGunWorld.com

  YOUR 1 STOP SHOP FOR PAINT GUNS AND SUPPLIES!
How to trouble shoot your spray gun
spacer

To protect your spray gun make certain you clean and lube your gun immediately after use. Do not soak your gun.
Help clean your gun with a good cleaning kit - Please do not leave material in the can unattended for over 1 hour.
trouble

 

To protect your spray gun make certain you clean and lube your gun immediately after use. Do not soak your gun.
Help clean your gun with a good cleaning kit - Please do not leave material in the can unattended for over 1 hour.

Priming and molding tips.

“Alligatoring” Not enough catalyst used. Check for proper catalyst levels.
Substrate/primer incompatibility,
chemical reaction.
chemical reaction.
Check compatibility of surfaces
and products.
Primer sprayed on cold surface. Expose surface to higher temperature
before spraying when
ambient temperature is below
60°F, 16°C.
Substrate not cured, gassing underneath
primer.
Completely cure putties, pastes
and compounds before applying
primer.
Cracking Primer sprayed too thickly, too
fast.
Increase the number of passes,
adding dwell time between
coats. For exceptionally thick
buildup, allow for gel to occur
before spraying and sanding further.
Curing occurs on surface, but
not on substrate interface
Primer sprayed on cold surface;
primer cure inhibited.
Expose substrate surface to
higher temperature before
spraying when ambient temperature
is below 60°F, 16°C.
Bubbles Dimples (craters) Film build-up too rapid, solvent or water
trapped in primer.
Increase the number of passes
with less primer per pass to
achieve desired thickness. Allow
for "flash-off" between passes.
Dry over-spray Acetone used as a thinner. Use slower solvent retarder
Waterbase used water only User extender or fleutrol
Spray pressure too high. Lower gun regulator 18-30 psi with trigger pulled or line pressure at 35-50 psi.
Spray gun orifice too small. purchase larger orifice
Substrate contaminated. Do not use a "tack rag", slow
evaporating solvent or solvent
soluble or colored rags or paper
to wipe the substrate surface. "tack rag" used for pure surface.
Contamination in the air. Spray in a clean area to minimize
airborne dust, water,
waxes and/or silicones.
Contamination in the air line. Spray with dry, filtered air. See our filter Section
Gelling or lumps in the fluid container Outdated product. Replace with new product. Rotate
products to use older primers
first.
Lifting or peeling Substrate not cured or substrate
and primer incompatible.
Completely cure putties, pastes
and compounds before applying
primer. Check compatibility of
surfaces and products.
Orange peel Spray equipment set up incorrectly. Follow the instructions for equipment
setup or ask us.
Spray pressure incorrect. Guns typically have an optimal operation level - always set with trigger fully pulled.
Pot pressure incorrect. 3-12psi is typical. Top coats 4-6psi.
Viscosity too high.

You may thin beyond the 10% limit set by manufacturers. Retarders are usually the prefered method of thinning.

 

Gel - Pattern surface sticks to mold upon release Improper release preparation. Follow paint manufacturer’s instructions
when applying release materials.
Primer not fully cured before
compounding and polishing.
Follow paint manual instructions in the application
guide for pattern surfacing.
Improper release materials. Use only sealer-glaze and wax
release materials.
Pinholes Substrate porosity Fill porous areas with product - sanding
Plug/pattern surface not hard or
glossy
Primer not allowed to “breathe”
after sanding.
Allow time for solvents to escape
before compounding and
polishing.
Surface wet sanded when undercured;
primer absorbed water.
Dry sand with initial sanding
step. Wet sand after “breathing”
occurs.
Ambient temperature less than
60°F, 16°C when primer was
sprayed.
Expose surface to higher temperature
before spraying.
loses gloss
Primer not fully cured prior to
compounding and polishing.
Dry sand with initial sanding
step. Wet sand after “breathing”
occurs.
Old, outdated primer. New product.
Porosity Spray pressure too high. Reduce pressure but not under 18psi unless spray gun is a low pressure gun
Spray orifice too small. Purchase larger orifice for your gun
Acetone used as thinner. Use slower solvent retarder
Waterbase used water only User extender or fleutrol
Pre-release of primer lifting Primer sprayed too thickly. Get Mil Thickness from manufactuer of paint
Primer not completely mixed. Machine mix if necessary completely prior to
spraying,
Primer not continuously mixed. Agitate or stir continuously when
spraying for 2 part products or solid content that settles.
Improper release system used. Use higher surface energy release
system.
     


 

 

 

 


We also have a wide selection of quality tools for the Professional and Serious Hobbist at www.SprayGunWorld.com.



 
SprayGunWorld