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Alligatoring
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Not enough catalyst used. Substrate/primer incompatibility Chemical reaction.
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Check for proper catalyst levels. Check compatibility of surface and product. Primer sprayed on cold surface Expose surface to higher Temperature before spraying When ambient temp if below 60 degrees F.
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Blisters
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Substrate not cured, Gassing underneath primer.
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Completely cure putties, pastes and compounds before applying spray materials. A low temperature curing oven may be required in cold climates.
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Cracking
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Primer, or Color coat spray too thick, too fast
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Increase the number of passes, adding dwell time between coats. For exceptionally thick buildup, allow for gel to occur before spraying further.
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Curing occurs on surface but not on substrate interface
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Material sprayed on cold surface; material cure inhibited.
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Expose substrate surface to higher temperature before spraying when ambient temperature is below 60 F.
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Dimples (Craters )
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Film buildup too rapid, solvent trapped in material.
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Increase the number of passes to achieve desired thickness. Allow for “flash off” between passes.
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Dry over-spray
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Wrong reducer as thinner. Improper amount of reducer/thinner.
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Spray gun orifice too small. Use larger orifice. Spray pressure too high. Set line pressure at 35-50 psi. Use proper/amount of reducer.
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Fish eyes
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Substrate contaminated.
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Do not use a “tack rag”, slow evaporating solvent 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.
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Gelling in the container
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Outdated Product. Too much catalyst.
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Replace with new product. Check proper addition of catalyst.
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Lifting or Peeling
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Substrate not cured or substrate/primer incompatibility
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Completely cure under coats, primers, putties, pastes, and compounds before applying materials. Check compatibility of surfaces and products.
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Orange Peel
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Spray equipment set up incorrectly
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Follow the instructions for equipment set up. Spray pressure incorrect. Set pressure at 35-50 psi. Pot pressure incorrect. Set pressure at 10-12 psi. Viscosity too high Thin with proper amount of reducer.
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Part surface sticks to mold Upon release
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Improper release preparation.
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Follow manufacturer’s instructions when applying release materials.
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Pinholes
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Substrate Porosity
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Fill porous areas with product using pallet knife, squeegee, brush or roller before spraying. Re-surface the part with #600 wet sand paper.
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Spitting
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Improper material reduction (cut). Dirty or plugged spray gun.
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Check for correct addition of reducer (material too thick).
Disassemble & clean spray gun
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