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Troubleshooting guide solutions to common finishing problems

Troubleshooting Guide Solutions to Common Finishing Problems CContents Adhesion Intercoat Stain Substrate Air Entrapment Bénard Cells Bleeding Blocking Blooming Blushing Brittleness Brown Spots Bumps and Sinks Cold Check Cratering Crawling Discoloration Dry Fat Edges and Picture Framing Fish Eyes Floating Flooding Gloss Variation Grey Pores Haze Hiding Lifting Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page CContents Marring Mud Cracking Orange Peel Printing Rub Up Sagging Seeds Separation Silking Skinning Solvent Popping Solvent Trap Tearing Telegraphing White Spots Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page CAdhesion ?? Intercoat Problem Delamination between coats Whitening of ?lm between coats Solution Ensure correct sanding between coats Topcoat within recommended time limit after sanding Allow correct dry time of sealer coats Use correct ?nishing system Ensure no contamination on previous coat Apply a wet coat material Do not fog or mist coating to apply thinner ?lm builds Adhesion ?? Stain Problem Delamination to stain Whitening of ?lm between coats Solution Reduce application of stain Ensure suf ?cient wiping of stain Allow correct dry time of stain Dark stains should be obtained by using toners before stain application Avoid heavy shading Make sure to use the correct ?nishing system sealer topcoat to match stain Apply wet coat of sealer or topcoat Do not fog or mist coating to apply thinner ?lm builds Adhesion - Substrate Problem Removal of ?lm to substrate Delamination to substrate when impacted Solution Ensure correct sanding of substrate Use correct ?nishing system to match topcoat with primer used Ensure no contamination on substrate Apply wet coat of material Do not fog or mist coating to apply thinner ?lm builds Closed grain hardwoods should be well sanded before use Higher solids ?nishes need a better wood pro ?le to anchor to than low solids Ensure sand paper is not worn CAir Entrapment Problem Bubbles from pores in the wood Air entrapment from preparation of paint Air entrapment from application Blistering from drying techniques Topcoat attacking previous coat Solution Use defoamer Use slower solvent balance Change air ow during drying check for drafts Reduce air pressure during application Spray thin wash coat as ?rst coat Ensure adequate ash o ? before oven Reduce viscosity Bring lacquer to room temperature Use correct thinner Use weakest solvent for previous coat to avoid blistering Reduce recirculation speed Reduce ?lm thickness Bénard Cells Problem Cell pattern in ?nish Color and surface irregularities Solution Add dispersant Add silicone additive to reduce surface tension Increase application viscosity Lower application thickness Add thixotrope or thickener Bleeding Problem Color migration from coated substrate Color in sanding dust Colored ?lm on surface Solution Avoid bleeding dyes and pigments Use vinyl sealer to seal color Change from acid catalyzed material CBlocking Problem Sticking together of panels when dry Solution Reduce ?lm build applied Increase or ensure recommended dry times are followed Ensure ovens are at the correct temperature Increase