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Sources of interior moisture are condensation (windows & sills), spills, leaking roofs, condensation from coldwater pipes, or plumbing leaks (ceilings under bathrooms). Initially, these sources of moisture will just cause staining of painted surfaces, but if not corrected, peeling results.
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| Moisture accumulating behind an exterior paint surface is a common cause of adhesion failure. Poor caulking, lack of vapour barrier in older homes, cracked siding boards, plugged gutters and uncoated edges of planking on decks are the most common entry points. Once moisture gets into the surface, peeling paint soon follows, particularly if the paint is a dark glossy product exposed to direct sunlight.
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Reliable adhesion of latex paints to old alkyd surfaces
depends on:
- The type of latex used in the product; 100% acrylics generally
have the best adhesion
- The finish of the alkyd; flat alkyd is easily over-coated,
whereas gloss alkyd is not
- The finish of the latex used; gloss and semi-gloss latex paints
have better adhesion to alkyd paint than eggshell and flat
- The amount of sanding done before painting; the old alkyd
surface must be properly de-glossed, not just scuff sanded
- Whether all grease and soap residue has been properly removed
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| See Preparing the Surface (below) to determine how to properly prepare concrete and wood for painting, to prevent future failure of the paint on the floor's surface. Also have ready a bottle of anti-skid media (e.g. sand, walnut shells, cork, etc.) to sprinkle onto the top coat of paint, to prevent slipping on the surface when the floor/porch is wet. |
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Paint both sides of wooden garage doors to avoid warping due to absorption through the back of the door.
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| To allow the paint to flow and level out when painting paneled doors, it may be beneficial to thin the paint slightly, up to 10% (use water for acrylic latex paints, and mineral spirits for alkyd paints). This will also prevent one area from drying before you can blend back into it from neighbouring areas. |
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| Do not dispose of mineral spirits down your drain; it harms the environment. Pour used solvent into a metal can, and dispose of it at a proper hazardous waste facility. A brush and roller spinner quickly and thoroughly cleans and dries brushes and rollers. |
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General
Plan on 1 - 2 days for preparatory work including repairs and washing
the surface. Allow at least one day for the surface to
dry.
Repainting Previously Painted Surfaces
After sanding the desired surface, use primer before top coating.
If you suspect the old glossy surface to be an alkyd paint
and you would like to apply a new latex topcoat, apply a coat
of latex primer after washing and before applying a top coat
of Latex Paint.
Preparing Unpainted Surfaces
Bare Wood:
Exterior Latex Paints are 100% acrylic, allowing harmonious expansion
and contraction of the paint film with the surface substrate
during temperature extremes. Pure acrylic Latex Paints also
allow humidity from inside the house to escape through the
wood and through the paint film without causing the paint to
peel.
Pre-finished Aluminum:
If pre-finished aluminum is glossy, lightly sand then apply a
coat of Acrylic Latex Primer before applying the topcoat, to
ensure lasting adhesion.
Vinyl Siding:
Never use a color darker than the vinyl, to prevent warping from
the sun's heat.
Bare Masonry: (Stucco, brick, concrete block,
cement)
New masonry is very alkaline, and is best not painted for a year,
after which a pure acrylic primer is recommended, followed by
pure acrylic Exterior Paint. If you must paint sooner, wait at
least 30 days. |
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