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Runs / SagsPhenomenonFilm is partly sagged by irregular flows when applying an excessive amount of paint at once.CauseA. Diluting the paint too much.B. Using slow type solvent too much during spraying.C. Applying thickly without flash time.D. Too hot or cold substrate.E. Too low spray pressure.RepairA. Dry the film completely, sand the sagging area with #600 sandpaper and refinish.B. For light sag…

PinholingPhenomenonSmall holes appear on the film.CauseA. Solvent evaporates quickly and makes holes during drying.B. Application in hot and humid condition.C. Using improper thinner.D. Improper preparation of primer. (e.g. holes in putty)RepairRemove or sand the damaged area and refinish.PreventionA. Do not apply thickly at once.B. In case of heat drying, take a waiting time and rise the temperat…

YellowingPhenomenonThe paint film turns into yellow.CauseA. Using lacquer with nitrocotton(NC).B. Using yellowing type hardener for urethane.C. Long exposure to strong ultraviolet rays.RepairClean with compound or refinish with non-yellowing type paint.PreventionUse non-yellowing type paint. Especially in case of metalic paint, clearcoat should be non-yellowing type. (TC-9300, TC-5800, Master Clea…

SkinningPhenomenonA layer appears on the surface in container.CauseA. Paint reacts with oxygen in the air and makes a dried layer on the surface.B. Small amount of paint with empty space in a big container.RepairRemove the dried layer, stir and filter the paint before application.PreventionA. Seal the container and store indoors at 20℃ or less.B. In case of storage of oxygen reacting paint(enamel,…

FisheyesPhenomenonSmall craters or circular openings appear on the film.CauseA. Applying on the grease, oil or wax.B. Water in the spray air.C. Applying near the place working with wax or silicon.RepairSand the affected area and refinish.PreventionA. Clean the substrate clearly before application.B. Install an air filtering system that removes moisture in air hose.

CrazingPhenomenonIrregular cracks like bird footprint appear on topcoat film during drying.CauseA. Applying at too cold temperatures. B. Solvent in topcoat infiltrates into the previous paint film during initial topcoat application.RepairRemove the cracked area and refinish.PreventionA. Use fast type thinner.B. Apply urethane primer-surfacer(PS-330, PS-550) before applying topcoat.

SettlingPhenomenonHeavy pigments is settled at the bottom of container.(If the paint is stirred and mixing well, it is fine.)CauseA. Storing for long time or at high temperatures.B. Big amount of pigments.C. Low viscosity of paint.RepairStir the paint before using and discard the hardened one.PreventionA. Store indoors at 20℃ or less within the shelf life.(1 year)B. Turn the container upside down …

WrinklingPhenomenonIrregular wrinkles appear on the film surface.CauseA. Applying synthetic enamel too thick.B. Applying at high temperatures in high humid condition.C. Diluting synthetic enamel with lacquer thinner.D. Applying urethane clearcoat on lacquer basecoat film.RepairA. For severe wrinkles, remove the film completely and refinish.B. For light wrinkles, sand with #400 sandpaper and cover …

Orange PeelPhenomenonDried film has surface like orange peel.CauseA. Too high air pressure or air blowing with spray gun before the film cured.B. Adding not enough thinner to basecoat.C. Too high application temperature.D. Improper setting of spray gun.E. Too thin film thickness.RepairDry the film completely, polish with compound and refinish.PreventionA. Use smooth sandpaper.B. Cover the previous…

Sand Scratch SwellPhenomenonSanding marks of the previous paint film appear on the new paint film after drying.CauseA. Improper preparation of the substrate.B. Sanding with too coarse sandpaper.C. Sanding undercoat before it thoroughly dried and applying topcoat.D. Failure of covering the previous film.E. Too thin film thickness.RepairDry the film completely, polish with compound and refinish.Prev…

DiscolorationPhenomenonMixed pigments are separated during drying and occur inequality of color.CauseDispersibility of pigment, mixing property of resin and solubility of thinner.RepairRemove the damaged part and refinish.PreventionA. Use fast type thinner.B. Use thinner with high solubility.

Putty Mark / Staining Bleed Through (Discoloration)PhenomenonDiscoloration of the topcoat on the area repaired with polyester putty.CauseA. Polyester putty are not soluble in topcoat solvent and it makes boundary with the topcoat film.B. Putty is more contractive than other paint film.RepairRemove the damaged part or sand to putty layer and cover with urethane primer-surfacer(PS-330, PS-550) and r…

BleedingPhenomenonDiscoloration in the topcoat.CauseA. Soluble dyes or pigments of undercoat are dissolved by the solvent of topcoat and rise to topcoat. (red or yellow)B. Tar on the body rise to topcoat.RepairRemove the previous paint film or cover with acrylic primer-surfacer(PS-220) and refinish.PreventionUse the primer-surfacer(PS-220, PS-330, PS-550) before applying the new coating.

PeelingPhenomenonA loss of adhesion or separation of the paint film from the substrate.CauseA. Improper preparation of the substrate. (Remaining moisture or oil)B. Applying incompatible products together. (e.g. urethane and lacquer types)C. Applying without sanding the previous paint film.RepairRemove the area wider than the damaged part and refinish.PreventionA. Clean and prepare the substrate th…

BlisterPhenomenonSwelling as bubbles or pimples in the film.CauseA. Applying over water, grease or oil.B. Rust on the substrate.C. Exposure to the high humid condition.RepairSand the swelling area or peel off to the substrate and refinish.PreventionA. Wash the substrate clearly.B. Have enough drying time between coatings.C. Remove the moisture in the air hose.