Sheenlac Colour Catalogue & Tips and Tricks

TIPS & TRICKS

For Wood Coatings
For Wall Paints

For Wood Coatings

IN CONTAINER / PACKING

Settling / Precipitation

Viscosity / heavy-bodied

Skinning / Gelling in container

Discoloration / Floating particles

Foaming

DURING APPLICATION

Dirt / Seediness

Excessive material usage

Excessive Spray - Fog / Dry

Orange Peel

Defects due to problem in Spray Gun

Sagging

Spray pattern split

Flow / Levelling

DURING AND AFTER CURING

Poor adhesion to Substrate

Poor adhesion between coats

Poor drying / Non-drying

Bleeding / Leaching

Wood Blistering

Blooming / Oil Blooming / Cottoning

Blushing

Blocking / Printing / Excessive print

Brittleness

Checking / Crazing of film

Cracking / Peeling

Cratering

Darkening

Discoloration

Drying time

Gloss changes of flat spots

Hazing

Lack of Hiding

Marring

Moisture Blistering & Peeling

Pin-holing / Bubbling

Shrinking / Wrinkling

Spots

Temperature Blistering

Yellowing

For Wall Paints

ON MASONRY SURFACE

Dampness

Undulations

Higher Alkalinity

Algae & Fungus growth

Cracks on walls

IN DECORATIVE PAINTS

Bitty film consistency

Storage defect - Foul smell

Storage defect - High Viscosity / Gelling / Curdling

Storage defect - Settling / Vehicle separation

DURING APPLICATION

Sagging

Chalking

Blistering

Poor Adhesion

Wrinkling

Brush marks

AFTER APPLICATION

Fading / Poor color retention

Dirt Pick-up

POSSIBLE CAUSES	SOLUTIONS
	SETTLING OR PRECIPITATION When components settle down and harden, the defect is termed as Settling or Precipitation.
• Using Wrong Thinners	• If the settling seems moderate, add proper solvent and agitate continuously, till resolution. • If need be, use stronger solvents.
• Paint too Cold	Warm the paint till its temperature reaches 20-30℃.
• Over- Reduction	Add more fresh paint to get the right consistency.
• Quick Addition of Reducer or Catalyst without sufficient Stirring	Add the Reducer or Catalyst slowly and stir constantly.
• Settling of Pigment or Flattening Agent at the bottom	• Check the bottom of the paint container with a spatula. • Stir paint thoroughly before use.

POSSIBLE CAUSES	SOLUTIONS
	VISCOSITY OR HEAVY-BODIED When the paint’s consistency becomes thicker, it’s termed Viscosity and since it is heavier, it’s also called Heavy-bodied.
• Evaporation of Solvent in the paint, at normal temperature that causes it to become heavy-bodied.	• Use the same solvent, used by the manufacturer to make the paint. • Check the viscosity manually, using a cup.
• Using Improper Solvents for Thinning	Use recommended solvents for thinning purposes.
• Using Catalyzed materials beyond the pot life of the paint	Look for directions and see, if it’s mentioned whether the paint can be recovered by adding additional paint and catalyst.

POSSIBLE CAUSES	SOLUTIONS
	SKINNING OR GELLING IN CONTAINER The paint develops a thin coat on the top or gels inside the container and this defect is called Skinning or Gelling.
• Air-Drying Material is Exposed to air because it is partially full	• Float the thinner on the surface of the paint and seal it tight. • Also you can put the content in a new can and seal it tight.
• Material has Gelled beyond a certain point	Discard the paint as it cannot be recovered.
• Storing the product at High Temperature outside or beyond the Shelf-life	• Store the product inside, at room temperature. • If the product is polyester, Polyurethane or Pre-catalyzed Lacquer, use it before six months.

POSSIBLE CAUSES	SOLUTIONS
	DISCOLORATION OR FLOATING PARTICLES When the paint comes in contact with floating particles in the painting area, discoloration is a possibility. Discoloration can be caused by other factors/reasons too.
• Vapours or Fumes are present in Painting Area	Check for the presence of ammonia or amine fumes from adhesives or any other sources.
• Reaction of Aluminium and Steel parts in the spray equipment with Water Borne or Acid Cure	Use stainless steel or solvent resistant plastic parts and liners in spray equipment.
• Paint Lining comes off or the Drum is improper	• Strain the paint through a cheese cloth or a fine filter. • Ensure no contaminants are present in the filter.
• Presence of Old Nitrocellulose Products	Discard and use fresh material only. Since, it can become amber on aging in the can and react with steel.
• Chemical Reaction to Surface Treatments	• Check the pH of the surface. • If it is in the acidic range, it can react with the alkaline materials.

POSSIBLE CAUSES	SOLUTIONS
	FOAMING When foam is formed and it bubbles inside the container, it is referred to as Foaming.
• Mixing Rapidly	• Mix slowly. • Ensure not to shake using mechanical shaker.
• Trapping of foam in the Container	Use the recommended De-Foamer.

POSSIBLE CAUSES	SOLUTIONS
	DIRT OR SEEDINESS Dust and dirt particles settle on the surface, during the application of the paint, the condition is called Dirt or Seediness.
Unclean Conditions in the Surrounding Area	Ensure that the painting area is clean.
Dust in the Spray Room or Drying Area.	Rearrange equipment so that any spray dust from the booths or other workshop areas does not reach the finishing room.
• Dirt in Air or Paint line of spray apparatus. • Sanding near the Paint area can blow fine dust particles in the air.	• Check for the Presence of dirt and oil in the paint area by spraying air from the spray gun, on a white clean cloth. • After spraying look for any dirt or oil marks on the cloth.
Improper Thinning results in Resin Kick-Out, rendering the resin incompatible.	Thin the paint perfectly with the recommended right thinner.
Paint subjected to extreme Cold results in Reduced System Compatibility or Solubility that causes seediness.	• Warm the paint to reach room temperature or 25℃, prior to application. • If the paint is still seedy, consult your coatings supplier.
Dirt in Paint	Strain paint before painting.
Appearance of particles after spraying is done and not while spraying the wet film.	• Use a magnifier to rule out the possibility of air bubbles. • Pour some paint on a glass surface and let it dry in dust-free area. • After drying, examine the glass by holding it near a light source and look for the presence of any dirt or dust particles.

POSSIBLE CAUSES	SOLUTIONS
	EXCESSIVE MATERIAL USAGE When the spray gun is not held as per the recommended guidelines, defects begin to appear. These defects are a direct result of Excessive Material Usage.
Failing to Trigger the gun at each stroke	• Release the trigger after every stroke. • Make it a habit.
Holding the Gun too Far from the surface	• Hold the spray gun at a distance of 6-10 inches at right angle to the surface that needs to be painted. • Work the gun always at right angle to the surface.
Fluid Pressure in the spray gun is too Low	• Increase the fluid pressure. • Check by cutting off air to spray gun. • Hold the spray gun at shoulder height and now adjust the stream of paint to fall approximately 3 feet from the gun.
Air Pressure is too High in the spray gun	Set low Air- Pressure.
Wrong Air Cap or Fluid Tip	Use proper combination as recommended by the manufacturer’s guide.
Depositing Material Film or Irregular Thickness	• Calculate the depth of the wet finish film accurately. • Learn out of experience.

POSSIBLE CAUSES	SOLUTIONS
	EXCESSIVE SPRAY – FOG / DRY When the spray gun ejects excessive paint not as per recommended guidelines, defects appear. They are a direct consequence of Excessive Spray.
Using Wrong Solvent blend	Choose a slow evaporating thinner.
Atomizing Air Pressure too High	Use necessary amount of compressed air only.
Over Reduction of Material	• Use less reduction. • Add fresh material to over reduced material.
Holding the Gun too Far from the surface.	Hold the spray gun at a distance of 6-10 inches as recommended.
Spraying Past the Surface of the product	Release trigger as the gun passes the target.
Wrong Air Cap or Fluid Tip	Use proper combination as recommended by the manufacturer’s guide.

POSSIBLE CAUSES	SOLUTIONS
	ORANGE PEEL When the coated surface develops a kind of finish that resembles an orange peel, the defect is termed Orange Peel. The coating is not smooth but exhibits the texture of an orange.
Improper Thinning of paint	• Choose solvents that evaporate slowly. • Use recommended amount of thinner.
Using Poor Grade Thinner	Use better grade thinner for material.
Failure to Deposit a Wet coat	• Check solvent. • Use correct spread and overlapping of stroke.
Material Not Dissolved thoroughly	Mix material thoroughly.
Presence of Drafts (Synthetics & Lacquers)	Eliminate excessive drafts.
Presence of Low humidity, causing rapid dry conditions	Raise humidity of room.

For Wood Coatings

IN CONTAINER / PACKING

DURING APPLICATION

DURING AND AFTER CURING

For Wall Paints

ON MASONRY SURFACE

IN DECORATIVE PAINTS

DURING APPLICATION

AFTER APPLICATION

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