Defeitos e danos na pintura

501-36-19 Paint - General Information 501-36-19 DESCRIPTION AND OPERATION ‡ Crack formation ‡ Shrinking back/zone edge marks ‡ Blistering ‡ Etching ‡ Paint wrinkles/puckering ‡ Cloud formation ‡ Spots/metallics ‡ Metamerism/color deviations ‡ Washing out ‡ Loss of gloss ‡ Covering ability/areas of thin paint ‡ Flow problems/orange peel ‡ Dirt embedded in metallic base paint ‡ Dirt embedded in top coat ‡ Water marks ‡ Paint runs ‡ Swirl marks Craters Crater-like single or extensively occurring depressions with raised edges, in top coat or the intermediate layers. Cause/damage pattern: ‡ Substrate not adequately cleaned with silicone remover. ‡ Spray air contaminated by oil residues and water accumulations. ‡ Filter ceiling not adequate for requirements. ‡ Use of polishes, cleaning agents or sprays (e.g. interior sprays) containing silicone. ‡ Oil, wax, grease, silicone containing residues. ‡ Working clothes contaminated by materials containing silicone. TO BE UPDATED LATER Repair of damage: ‡ Sand paint surface, clean with silicone remover and apply one thin spray pass. Let it begin to dry well, then apply several thin and dry sprayed passes. Paint boils Small, hard, closed or burst blisters in the paint top coat. They appear locally in groups or spread individually across the whole surface. Sanding opens up a larger cavity, under which the primer can often be seen. Cause/damage pattern: ‡ Paint applied in layers which were too thick. ‡ Specified flash-off and drying times between coats were not adhered to. ‡ Specified working viscosity and spray pressure were not adhered to. ‡ Use of unsuitable hardener and thinner materials. (Solvent combinations in paint system not optimally matched). ‡ Poor booth conditions. TO BE UPDATED LATER Repair of damage: ‡ Single boil blisters can be removed using polishing. ‡ After thorough drying, sand the top coat at the affected areas, clean with silicone remover and re-paint. Fill any fine pores still present with 2-component acrylic filler. ‡ On larger areas of damaged topcoat, sand completely away and apply new paint finish. Adhesion defects Whole coating detached from substrate or individual layers one from another. Sometimes