Condition
When top coat layer of car paint swells up then it appears like bubbles /blisters sometimes months after application.
Causes
- Improper surface cleaning or preparation. Dust lift on the surface can hold moisture for long, when temp/atmospheric pressure increases; the moisture expands and builds up pressure, resulting in blisters.
- Low quality thinner that evaporates too quickly can also be the reason.
- Excessive film thickness ,insufficient drying time between coats or too heavy an application of the undercoats can trap solvents that later escape & blister the colour coat.
- Contamination of Compressed air lines with oil, water or dust.
Prevention
- Thoroughly clean the areas to be painted before and after sanding.
- Use good quality thinner preferably SVE Thinners.
- Allow proper drying time for under coats & top coats. Let each coat flash before applying the next coat.
- Drain & clean air pressure regulator & drain air compressor daily.
Treatment
- In mild case these blisters can be sanded out & refinished.
- If the damage is severe ,the paint must be removed down to undercoat or substrate ,sand and clean substrate thoroughly with SVE Degreaser and then refinish using SVE products.
Condition
When top coat layer of car paint swells up then it appears like Lines or cracks are more parallel and range from very short up to about 18”
Cause
Excessive film thickness, improper surface preparation.
Prevention
- Avoid pilling on top coats. Allow sufficient flash & dry time.Do not dry by gun fanning.
- Thoroughly clean the substrate with SVE degreaser before sanding it .Ensure the surface is completely dry before applying undercoats & top coats.
Treatment
Sand down the top coat completely & repaint it with SVE alternative product listed.
Condition
holes in the finish ,putty or body filler usually the result of trapped solvents, Air or moisture.
Cause
- Improper surface cleaning or preparation.
- Wrong gun adjustment or technique, paint application is too wet.
- Thick paint application.
- Wrong thinner or reducer: Solvent is trapped by subsequent top coats or solvents, pop breaks from paint layer.
- Improper dry: Fanning a wet finish can drive air into surface or cause a skin dry that results in pin holing when air or solvents come to surface.
Prevention
- Thoroughly clean all areas to be painted .Ensure all surface are dry before applying coatings.
- Drain & clean air pressure regulator & drain air compressor daily.
- Use proper gun adjustment ,technique & air pressure.
- Select the thinner or reducer that is suitable.
- Allow sufficient flash & dry time.
Treatment
- Fill the holes with SVE putty.
- If unsuccessful, sand and clean defective area.
- Repaint with alternative listed products.
Condition
Irregularity in surface of paint or top coat film resulting in damped surface.
Cause
- Improper gun adjustment & Techniques.
- Improper flash or drying time causing subsequent coats to loose solvents to dry coats.
- Mixing incorrect ratio.
- Thick Paint viscosity.
- Using fast evaporating thinner or reducer.
Prevention
- Use proper gun adjustment, technique & air pressure.
- Allow sufficient flash time, do not dry by fanning.
- Allow proper dry time for under coats & top coats.
- Mix all pigmented coating thoroughly and in correct ratio.
Treatment
- Fill the holes with SVE putty.
- If unsuccessful, sand and clean defective area.
- Repaint with alternative listed products.
Condition
Excessive flow on vertical surface resulting in drips on painted surface.
Cause
- Improper spray gun setting.
- Thin paint viscosity.
- Short flash off time when painting.
- Thick paint application.
- While applying spray gun, could be too close to the object or spraying speed too slow.
- Surface of the object could be cold or of low temperature.
Prevention
- Mixing ratio of thinner & coating should be appropriate.
- Avoid piling on finishes. Allow sufficient flash & dry time between coats.
- Use proper gun adjustment, technique & air pressure.
- Maintain a decent distance between spray gun & object.
Treatment
- Wash the affected area with appropriate solvent.
- Let it dry and sand the smoothen the surface before refinishing.
Condition
Small holes in the paint film caused by rapid evaporation of trapped solvent or air.
Cause
- Use of evaporating thinner or reducer.
- Humid atmospheric condition.
- Excessive film thickness, trapping solvents in under coats.
Preventions
- Select slow drying thinner or reducer that is suitable that is suitable for existing conditions.
- Atmospheric conditions should not be humid.
- Avoid pilling on under coats or top coats. Allow sufficient flash and dry time. Do not dry by fanning.
Treatment
- Wash the affected area with appropriate solvent.
- Let it dry and sand the surface before refinishing.
Condition
A stripped or spotting appearance in metallic paints caused by flakes floating together in paint film.
Cause
- Incorrect spray gun set up.
- Spray gum distance from surface is too close which is incorrect.
- Application of base coat is too wet.
- Mixing or stirring of paint not good enough.
- Not sufficient time for drying between base coat layers.
- Using of fast evaporating thinner or reducer.
- Uneven spray pattern.
Prevention
- Use proper gun adjustment, technique and air pressure.
- Select the thinner or reducer that is suitable fast solvent in cold, damp weather & slower evaporating in warm, dry weather.
- Mix all materials especially metallic thoroughly.
- Proper flash off time should be there in between the coats.
Treatment
- If matting appeared prior to clear coat application, a light control coat (With lower air pressure, increased gun distance & further reduce base coat) will even out.
- If matting appears after clear coat application, sand & refinish with SVE alternative product line.
Condition
Small crater like openings in the finish.
Cause
- Painting over surfaces contaminated with oil/wax/ silicon/grease etc.
- Use of thinner /reducer in place of solvent cleaner on the surface to be painted.
- Spraying over previously repaired areas having a existing fish eye surface.
- Oil contamination of air lines.
- Uneven spray pattern.
Prevention
- Clean the substrate or surface carefully before applying coating.
- Drain & clean the air pressure cylinder daily.
Treatment
- If fish eye appeared prior to clear coat application, a light control coat (With lower air pressure, increased gun distance & further reduce base coat) will even out.
- If fish eye appears after clear coat application, sand & refinish with SVE alternative product line.
Condition
Fine splits, small cracks that completely checker an area in an irregular manner.
Cause
- When 2 materials bonded together expand or contract at different rates causing lateral surfaces greater than the strength of bond.
- The expansion & contraction can be caused by chemical forces.
- Cracking can appear at any adhesion interface including that between substrate & primer or between primer & base coat or between base coat & clear coat.
Prevention
Only compatible materials or system should be used together.
Treatment
Sand down the affected area & refinish it with SVE alternative products.