Clean your screen filter

Materials entering the proportioning unit may require screening or filtering. Therefore, manufactures of the spray equipment commonly install y-strainers or filter housings on or near the machine to pre-screen the materials as they are transferred from the storage vessel prior to entering the proportioning unit. Proper cleaning or replacement of the screen filter must be completed daily or as needed to ensure proper material supply is achieved. Clogging and restriction of the screen filter may cause cavitation and/or poorly dispersed product known as off-ratio.
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Choosing a Screen

Machine screens and spray gun screens come in three different sizes; 80, 60, and 40 mesh. Using a larger mesh filter allows smaller particles to pass through your processing system and out the spray tip of the gun. For most polyurethane foam and polyurea, I suggest using 60 or 40 mesh screen to reduce filter clogging.

Cleaning A/B Filters

Sometimes chemical cleaning the A and B filters can leave too much residue and plug up the screen hole. My suggestion? Re-new your filter screens.

You can do it with a few tricks. Try using a light amount of heat from a torch and burn out any restrictions. Once the restrictions are burned off, use air to blow out excess from the screens. Finally, hold your screen up to a light to ensure it is clear and ready to use again.