| PROBLEM |
CAUSES |
SOLUTIONS |
| BLISTERING |
| » Poor quality of Thinner or other than recommended (PU Finish). |
| » Spray viscosity too high or too thick coat. |
| » Maturation time. |
| » Substrate temp. is high. |
|
| » Use only recommended or PU grade Thinner. |
| » Use Thinner in recommended proportion. Apply medium coats |
| » Give specified maturation time in case of two pack system. |
| » Apply at ambient temp. |
|
|
BLOOMING / BLUSHING |
| » High humidity. |
| » Wrong grade of Thinner. |
| » Spray gun & equipment not moisture free. |
|
| » Avoid spraying in high humid condition. |
| » Use recommended Thinner. |
| » Use moisture trap on air line. |
|
|
CRACKING |
| » Use of higher dose of Hardener. |
| » Filler or putty is of not proper grade or used thick layer.
|
| » Application of next coat without proper drying. |
| » Use of conventional putty / filler on exteriors. |
|
| » Use only recommended ratio of Base to Hardener. |
| » Use only recommended grade filler or putty. Do not apply in thick coat & remove excess of filler/ putty immediately after application & cut down to smooth finish after drying. |
| » Give recommended time between successive coats. |
| » Avoid conventional putty / filler for exterior applications. |
|
|
CRATERING (FISH EYES) |
| » Oil contamination from spray gun or equipment (compressor). |
| » Improper surface cleaning. |
| » Dusty working area. |
|
| » Clean surface free from oil, grease, dirt, dust, wax. |
| » Keep working area clean from free of dust & air-born contaminants. |
| » Keep working area clean from free of dust & air-born contaminants. |
|
|
ORANGE PEEL |
| » Spray Viscosity is too high & Material is not uniformly mixed. |
| » Air pressure too high. Wrong application Technique.
|
| » Poor quality Thinner. |
|
| » Use correct proportion of Thinner, Stir well to obtain uniform mixture |
| » Check the air pressure, Keep spray gun appox 6-8 inches away from substrate. |
| » Use recommended Thinner. |
|
|
PEELING OR DELAMINATION
(LIFTING OF
FILMS) |
| » Wrong Base to Hardener ratio. |
| » Wrong undercoat (e.g. filler or sealer). |
| » No Sanding between successive coats. |
| » Mixture not uniformly mixed. |
| » Wrong Thinner. |
| » Drying time for under coat insufficient. |
|
| » Use recommended ratio only.
|
| » Use recommended under coat. |
| » It is recommended to light sand between successive coats. |
| » Make uniform mixture of Base, Hardener & Thinner. |
| » Use recommended Thinner. |
| » Increase drying period specially during high humid conditions. |
|
|
PINHOLES |
| » Thicker coat. |
| » Wrong Thinner/and proportions. |
| » Wrong spray Technique. |
| » Mixture not matured before application. |
|
| » Apply medium coat.
|
| » Use recommended Thinner & proportions. |
| » Use recommended pressure & technique. |
| » Give recommended maturation time. |
|
|
POOR
HARDNESS |
| » Wrong Hardener ratio. |
| » Wrong Thinner. |
| » Insufficient curing. |
| » Stacking too quickly. |
|
| » Use recommended Thinner.
|
| » Use recommended ratio. |
| » Give sufficient curing time specially during monsoon. |
| » Allow it to dry in fresh air before stacking |
|
|
RUN DOWN
OR SAG |
| » Over Thinning. |
| » Too heavy coat. |
| » Wrong Thinner. |
| » Air pressure too low or spray gun held too close. |
| » Stacking too quickly. |
|
| » Use recommended proportion.
|
| » Apply medium coat. |
| » Use recommended Thinner. |
| » Check the air pressure & held spray gun appox 6 - 8 inches away from substrate |
|
|
SLOW
DRYING |
| » Wrong Base to Hardener ratio. |
| » To thick coat. |
| » Wrong Thinner. |
|
| » Use recommended ratio.
|
| » Apply medium coat. |
| » Use recommended Thinner. |
|
|
TOO MATT / GLOSSY FINISH |
| » Over Thinning. |
| » High humidity. |
| » Poor application technique. |
| » Insufficient stirring. |
|
| » Use correct proportion of Thinner.
Avoid application in high humid
|
| » conditions.
Avoid dry spray. |
| » Stir mixture uniformly. |
|
