Porter Paints

General Questions

What do primers-sealers do?
Primers-sealers provide a variety of performance properties such as stain blocking, corrosion inhibition, surface filling, and enhanced hide. Their main function is to satisfy the porosity of the surface so the topcoat does not penetrate into the substrate. The result is a surface, when topcoated, that looks better and lasts longer.

What is an enamel?
An oil or water-based, stain resistant, washable topcoat which is characterized by its ability to form a smooth, hard surface. Typically associated with a high gloss, but may also include lower degrees of gloss.

How should mildew be removed?
Remove all mildew from the surface by scrubbing with a chlorine bleach solution (one part bleach and three parts water) or a commercial mildew remover, while wearing rubber gloves and eye protection. Rinse thoroughly and paint as soon as the surface is dry to avoid recontamination.

What needs to be done if I'm repainting over a gloss paint?
Lightly sand to dull the sheen and clean the surface thoroughly. When recoating with an oil-based paint or Porter's ADVANTAGE 900 Interior/Exterior Acrylic Enamel, you may paint directly over glossy surfaces as long as they are clean.

Is a natural bristle brush better than a synthetic bristle brush?
The answer depends on the type of paint you plan to use. Natural bristle and synthetic brushes may be used with oil-based paints. Only synthetic bristle brushes should be used with latex or acrylic paints. (The water in latex or acrylic paints takes the oils out of natural bristles and they become unmanageable).

How do you determine what type of roller cover to use?
Use a quality cover for an easier, more uniform application. Lambswool is recommended for some oils and epoxies, otherwise use a quality synthetic fiber roller cover. A 3/8" to 1/2" nap roller cover is recommended for wall paint being applied to smooth drywall or plaster. Rough plaster and stucco walls may require a 3/4" to 1" nap cover. Use a 1 1/4" nap cover when painting concrete block or other extremely rough surfaces and the 3/16" nap cover is recommended to apply an ultra smooth finish when using an enamel.

Can a latex paint be applied over an alkyd enamel?
Traditionally, latex finishes cannot be applied to an alkyd enamel without proper surface preparation which includes sanding, cleaning, and priming. However Porter's ADVANTAGE 900 Interior/Exterior Acrylic Enamel, with its new age acrylic resin, may be applied directly to clean alkyd enamel surfaces.

Is there a paint that can be used to prevent moisture from seeping through basement walls?
A product containing Portland cement such as Porter's BLOC-LOC Waterproofing Block Filler can be used to waterproof masonry surfaces. Extreme moisture leakage, however, may require more extensive measures such as applying a vapor barrier material to the exterior surface of the walls, or contacting a certified waterproofing contractor to evaluate and repair the problem.

How can I paint my baseboard without getting paint on the carpet?
There are tools designed especially for this purpose. The Super Guide by Hyde® Tools is a metal shield that can be placed between the carpet and the baseboard allowing you to paint one section at a time. Another method is taping the carpet with masking tape or masking paper.

My windows have been painted shut. How do I open them?
Trim along the sealed area with a knife and gently apply pressure to separate.

What is the best exterior trim paint: acrylic or alkyd?
100% acrylic topcoats are typically the best due to color retention properties and flexibility. It is important, however, to use an oil based primer before using the acrylic topcoat when painting over bleeding woods like Redwood or Cedar. A complete acrylic system may be used on all other non-bleeding woods.

What causes exterior paint to chalk?
Some degree of chalking is normal. Some paint manufacturers have even touted this as a "self-cleaning" process. However, excessive film erosion can result in unsightly heavy chalk. Excessive chalking is caused by the disintegration of the paint film during weathering. Some common causes of heavy chalking include application to an unsealed surface, overspreading the paint, or poor quality paint. All can lead to premature breakdown by the weather.

Can paints be applied in cool weather?
Most latex or acrylic paints should not be applied when temperatures are below 50° F. Porter's ACRI-SHIELD LTC Low Temperature Exterior Acrylic paints may be applied as low as 35° F. Alkyd/oil based paints may be applied in temperatures as low as 40° F.

Why is it not recommended to paint in direct sunlight?
Paint needs to be liquid for a period of time for proper penetration and adhesion after application. The heat from the sun can cause the outer layer of the paint film to dry prematurely which could result in solvent entrapment, which can cause blisters to form.

What is the most common cause of blistering and peeling paint on exterior wood?
The most common cause is moisture. But blistering can also be caused by painting in direct sunlight, inadequate surface preparation, or using a low quality exterior paint.

Can aluminum or vinyl siding be painted?
Vinyl siding or new aluminum may be painted with a 100% acrylic finish without priming, as long as the surface is clean and dry. Weathered aluminum needs to be cleaned and then primed with an oil based primer before applying the acrylic topcoat. When painting vinyl siding, be sure that the color chosen is a shade no darker than the original color because dark colors absorb heat from the sun and may cause warping or buckling.

What steps are involved in painting my metal lawn furniture?
Wire brush to remove any loose or chipping paint, sand any rusted areas, spot prime those areas with a rust inhibitive primer like Porter's GLYPTEX Rust Inhibitive Primer No. 296 and finish with an oil based topcoat like Porter's GLYPTEX Urethane Gloss Enamel No. 4139 Series. Do not use a latex because it may become tacky when hot.

My gutters have peeled. How do I paint them?
The most common cause for gutter peeling is improper surface preparation. Power wash or wire brush the gutters to remove any loose material. Spot prime bare areas with PORTER GUARD Galvanized Metal Primer No. 290 for galvanized gutters, PORTER GUARD Alkyd Metal Primer No. 276 for copper or PORTER GUARD DTM Acrylic Primer/Finish No. 215 for painted aluminum gutters. Topcoat with a 100% acrylic like Porter's ACRI-SHIELD Acrylic Finishes.

What type of coating is best for wood decks and fences?
Most decks are constructed of pressure treated lumber. A penetrating deck stain tends to work best on the horizontal surfaces (flooring) of decks due to constant foot traffic. The vertical surfaces of decks and fences may be stained or painted according to personal preference. Check the porosity of the wood before attempting to stain by sprinkling water on the surface. If the water beads, then the stain will not penetrate the wood. If the deck is new, let it age for about 30 days and check the porosity again. If it is an existing deck, a deck cleaner and powerwasher may be used to prepare the surface for staining.

What is the best way to "rejuvenate" an old brush with dried paint in it?
Dried latex paint can be removed by soaking brushes in denatured alcohol and cleaning with a brush comb. You could also use a commercial brush cleaner for synthetic brushes like Sav-A-Brush® powder by Red Devil. Simply mix with water and soak brushes to remove dried paint. Oil based paint can be removed by soaking brushes in a liquid brush & roller cleaner which is especially formulated for oil based paints.

What do I do with old leftover paint?
A small amount of latex paint may be allowed to dry out naturally (adding cat litter will speed the process) and deposited in the trash. For oil-based paints, check with your local county environmental agency for a hazardous waste disposal facility near you.