Tech Tip - Refinishing Metal Side Seals
Posted By DEMILEC
** Note -This method of refinishing metal side seals is to finish a day
or job. The metal parts will no longer have the factory finish and may
scratch again. **
Hard flat surface - example: marble or granite tile sample.
Fine grit sandpaper - 1000, 1500 or 2000 grit. (Lower grit sandpaper may
damage the metal surfaces)
Place the sandpaper on the smooth hard surface. You may want to wet the
sandpaper to achieve a better finish. Only use two – three drops
of water. Hold the side seal with your finger tips and sand the scratched
surface on the sandpaper. Use a figure eight pattern to refinish. Do not
slide the side seal front to back; this will create fine scratches on
the surface. It is very important to apply equal pressure to the side
seal on all sides to ensure a flat and smooth finish. If the side seal
is angled this will damage the part and the gun will not work properly
causing it to leak. Before reinstalling the side seal, inspect the oring
and change it if damaged. Make sure the side seal is clean of contaminants
such as chemical or metal shavings. Grease all gun parts with Graco white
lithium grease and assemble the gun. Always trigger the gun 5 times before
opening the 5/16 nut driver fittings. This seats the side seals and mixing
chamber before the pressure valves are opened.
Please contact your local Technical Service Representative with any questions.