of wide patterned cracks in the paint film, resemblig alligator
scales. Usually caused by: multiple coats of oil based paints
that have become brittle with age; topcoat not bonding to a glossy
undercoat; insufficient drying time between coats; or a hard coating
over a soft primer.
- paint bubbles indicating loss of adhesion. Usually caused by:
trapped moisture; painting during high temperatures; using oil
paints on damp surfaces; high humidity during drying time; painting
warm surface in direct sunlight; or painting over heavy chalk.
- two painted surfaces sticking together when pressed together,
such as doors and windows. Usually caused by pressing newly
painted surfaces together before completely dry; excesssive
paint; or recoat before the first coat is dry.
- spots of increased sheen where paint is rubbed. Usually caused
by using flat finish in areas subject to heavy wear and soiling;
repeated spot washings using abrasive cleansers; or objects rubbing
against painted surface.
Failure - loss of protective seal due to loss of initial adhesion
and flexibility. Usually caused by filling roo large an opening;
wrong type of caulk; aged non-acrylic caulks; or prolonged contact
- excessive, heavy powdering. Usually due to natural weathering;
interior paints being used in exterior applications; over-thinning;
wrong product selection.
- aging dried paint getting hairline cracks that eventually crack
to the surface. Usually caused by: poor surface preparation; old
oil-based paint that becomes brittle; applying paint too thin;
delamination of unprotected wood; or substrate cracking underneath.
Void - paint not forming a continuous film when surface temperature
is too cold. Usually caused by: painting when the air or surface
temperature is below 50°F.
Staining - excessive collection of dirt and other debris.
Usually caused by: air pollution and flying dust
- crusty, white salt deposits leached from masonry or mortar as
moisture passes through. Usually caused by: excessive moisture;
inadequant venting of interior moisture laden areas; pH level
too high; or excessive lime in concrete mix.
- early loss of colour usually from direct sun exposure. Usually
caused by: paint colour that isn't light fast; overtinting; using
interior grade paint outdoors; or tinting white paint not intended
- uneven gloss with shiny or dull spots on painted surfaces. Usually
caused by: improper or lack of priming of porous surfaces; poor
painting techniques; painting over fresh paint or primer before
it's dry; uneven film thickness; drying during excessive high/low
Failure - excessive brush or roller marks causing non-uniform
surface. Usually caused by: using wrong type of roller or brush;
poor painting techniques; repainting partially dried areas; or
painting non-primed surfaces.
- excessive bubbling that leaves craters or depressions in the
paint film. Usually caused by using wrong roller; rolling paint
too fast; using old paint; painting over unprimed porous surfaces;
or painting when the temperature is over 90°F.
- salty looking discoloration. Usually caused by: protected areas
not receiving cleansing rains; dark colours over paint or primer
using excessive extender pigments.
Metal Peeling - an adhesion loss of the paint due to inadequate
surface preparation. Usually caused by no or improper priming;
improper surface preparation; improper choice of paint; not removing
rust, oil, etc.; or painting too soon after cleaning metal surface.
- accelerated deterioration of the top coat causing rapid luster
loss, usually in reds, oranges and yellow paints. Usually caused
by: use of gloss alkyd or oil based paint exposed directly to
sun; or thin paint film.
- wet and dry layers overlap during painting. Usually caused by:
inadequate stirring and improper thinning; too much heat or wind
during application; extremely porous surface; or painting too
large an area at one time.
- blotchy glossy water soluble spots on latex paints. Usually
caused by: painting in coll humid conditions. If moisture collects
on fresh paint before it has thoroughly dried, leaching may appear.
- areas of black, gray, brown spots, particularly in camp, shady
areas. Usually caused by: warm, humid conditions; poor air circulation
and little sunlight; shrubbery planted too close to building;
painting over mildew without removal treatment; poor surface preparation;
or hidden moisture sources.
- deep irregular cracks in dry paint film. Usually caused by:
applying paint too thick; or allowing paint to build up in areas
such as corners.
Incompatability - adhesion loss from top coat of latex over
many layers of old alkyd or oil based paint. Usually caused by:
painting over 3 or more layers of alkyd or oil based paint with
a latex top coat; inadequate surface preparation; or not using
a recommended top coat.
- darker colour where ceilings, windows, doors and corner areas
were cut-in with a brush. Usually caused by: improper cutting-in
technique using too much paint; not maintaining a wet edge;or
poor roller technique.
- failure of finish coat to cover previous coat. Usually caused
by: not enough paint; making severe colour change; wrong brush
or roller; improper or no priming; or overthinning the paint.
Resistance Failure - marking of paint from weight of object.
Usually caused by: not allowing enough time for proper curing
and drying of paint; applying finish coat before primer has dried;
or premature placement of weighty objects on painted surface.
Marks - stipple texture pattern from roller. Usually caused
by: incorrect rolling technique; excessive nap length on roller
cover; overloading roller with paint; or painting over slick surface
without proper priming.
- paint running down immediately after application. Usually caused
by: inadequate surface preparation; overthinned paint; applying
paint too thickly; spraying with gun too close to surface; painting
when too cold or humidity is too high.
Failure - excessive wearing away of paint film from repeated
scrubbings. Usually caused by: abrasive cleanser; using flat sheen
paint in gloss sheen area; scrubbing before paint has properly
(Roller) - a spray of paint droplets from roller cover a paint
is being applied. Usually caused by: economy roller covers; overloading
paint on roller cover; overspreading the paint; or wrong nap length
of roller cover.
- difference in colour and appearance between original and touch-up
paint. Usually caused by: poor technique; touching up with different
batch number and applicator; touching up at different temperatures;
failure to reduce touchup paint by up to 25%.
- migration of waxy additives used in reconstituted wood products
to the surface causing discoloration. Usually caused by: exposing
hardboard to weather too long before painting; not priming; using
wrong primer; orinadequate paint film thickness.
- rough, crinkled surface caused by drying interference and forming
a wrinkled skin. Usually caused by: applying paint too thickly;
painting over insufficiently cured primer; or painting during
extreme hot or cool/damp conditions.
- gradual formation of yellow cast in aging oil based paints.
Usually caused by using alkyd or oil based paints in white or
light colours; heat effect from stoves or heating ducts; limited
light exposure; or oxidation of oil based paints/varnishes.