Different Primers for Different Substrates Thank you for dropping by Eco Paint, and hope your visit is an enjoyable one. If this helps you, by all means, drop a line at the bottom, saying Hi, being Great hearing from you. Here there are several different types of primers for house painting, and we will try listing them all for a quick reference for either interior or exterior house painting. Many high quality house paints are available today giving lasting beauty and protection. Unless we’re speaking of Life-Time warranty paints having bonding primers
built right into formulas, every paint requires proper primer on substrate, under lament, or bare surface.
Good rule of thumb, “Primers bond better to substrates than quality house paints do, and quality coatings bond to primers much better than substrates themselves. When your doing siding repairs, most new siding has a factory primer, making repairs and replacements less costly, not having to prime. Many other primers are described below for drywall to siding, exterior painting and metals, naming general types, and not suggesting name brands.
Aluminum, Galvanized Steel
Clean surface, especially new rolled flashing and Galvanized surfaces, removing the oils that are applied in the factories, during production. Best cleaner is 50% vinegar and 50% water using a quick wipe down method. Also remove any crayon wax markings, and oxide powder applied from factory. Apply an Acrylic Latex rust-inhibitor primer, allowing to dry, and top coat with a quality 100% Acrylic Exterior finish coat.
Drywall mud and textures are a very porous material when dried. Priming before and after textures provides two different benefits. Priming before texture, allows texture to be applied more evenly, and allows texture to bond better to primer than drywall itself, especially when doing a knock-down texture, scraping points off with broad knives. Priming after texture allows paint finish coats to go on more evenly, without soaking into texture, not having dull and shinny spots. Drywall primers are generally flat PVA primers which dry rather quickly, and have spread rates of 250-300 square foot per gallon.
Clean surface, typically found with steel pipe handrails, outside stair stringers, and I beams. Removing as much rust as possible, a power tool works well for large areas, and steel wire brush for smaller ones. Remove dust from scraping, and apply 2 coats of rust-inhibitor primer, allowing to dry before applying top coats.
These surfaces are typically very porous and require a block filler that will seal cracks and crevices before finish coats. Normally these coatings use a spread rate of 100-150 square foot per gallon, and a spray and back-roll method is recommended. Finish coats will cover more uniformly and not see any dull spots to shinny ones.
A high quality latex or oil based wood primer. Make sure primer has stain blockers when covering stains, open grains, and sappy woods. Using Alkyd oil based primers, latex finish coats can be applied over, but not the other way around. Typically spray, brush or roll methods of application. If siding has no factory primer, best applying thin coat for adhesion properties. If new Cedar Siding is used, no need for primer when using Solid Body Stains, as you want some of the stain to soak into the wood, and not lay directly on top of surface.
Need to check what is previously used, as to above (New Wood). Scrape all loose mills currently peeling up, and those that have air pockets lying underneath, ready to peel up. Sand and feather edges, so when painted, mill thickness differences will not be seen. Priming entire surfaces are not required just because paint has become dried and chalky. Only when bare substrates are exposed, but if so many bare substrates on a particular wall or structure, it may be wise to prime entire substrate. Primers will maximize adhesion and uniformity appearance.
Best to sand down to new wood grain, allowing bonding primers to adhere and bond to substrates properly. Mostly found on trim, scraping, sanding, and feathering mill thickness edges before applying Alkyd or Latex primers. Also best to purchase top quality primer, which provides better bonding characteristics to substrates.
- If you have had any related priming concerns, we would like hearing from you.
- If this article has been helpful priming different surfaces, we would like hearing from you also.
- And don’t forget to visit our Flagship site Painting Denver and sister sites; Eco Paint Specialists, Painting Interior , and Painting Exterior being more specific to certain areas of house painting.