Many paints are advertised as paint and primer in one, however there are still situations where you’ll want to use a separate primer for your Toronto home, we’ll go through them in detail here…
Any Situation Where Adhesion is a Concern
There are primers that are specifically designed to adhere to glossy surfaces. A couple of our favorite high adhesion primers are Sherwin Williams Multi-Purpose Water-Based Acrylic-Alkyd Primer and Benjamin Moore Advance Primer
Think of it like this:
If you have a glossy floor and you put a cloth on top of it, slides easily, doesn’t it?
Put that same cloth on top of a slab of unfinished concrete, doesn’t slide so easy, right?
It’s analogous to paint:
Paint has trouble adhering to glossy surfaces, so there needs to be an intermediate step. We accomplish this by deglossing the surface by sanding, by priming the surface with a high adhesion primer, or by doing both. This is especially necessary when dealing with oil paint, so please read:
How do I know if the paint in my Toronto home is oil or latex?
Sealing out Stains
Many stains will bleed through latex paint, so a stain sealer is needed. Stains include pen marks (shame on you for drawing on your walls), mildew, water stains, knots in wood, nicotine, etc. A good shellac-based primer will seal these monstrosities out and allow you to topcoat with your choice of paint. One of our favorite shellac-based primer/sealers is Zinsser BIN, it’s like the Buckley’s of paint, “it smells awful, but it works!” Please use a respirator with shellac-based paint
Big Colour Changes
There are high-hide primers that streamline the task of big colour changes. If you are going from a mid-tone colour to an off-white using a high-hiding white primer is a great idea. High-hiding primer is cheaper than most finish coats, and it hides better than most finish coats.
Conversely, If you are painting a deep or intense colour, getting a grey primer will make the job that much easier. A good paint store will be able to advise you what shade of grey to use under the finish coat.
Porous Surfaces
A primer will soak into a surface better than a finish coat, so it’s advised to use a primer over new drywall and new drywall patch. Too often finish coat won’t penetrate deep enough into a drywall patch and that area will end up peeling over time, so if we use primer we can prevent that.
Are there any situations where I can use a “paint and primer in one” product?
Sure, if the surface is
- clean
- not too glossy
- there’s not a big colour change
- no stains
- not much patching – maybe a couple of nail holes and that’s it
If this sounds like your painting project then a “paint and primer in one” product is a great choice.