Yes, waterborne alkyds are designed for superior adhesion and can often be applied directly over latex paints without a primer, though surface preparation remains crucial.
Interestingly, oil-based paint will adhere to latex paint.
Painting with an oil based paint over latex is OK but doing the reverse will cause you grief for many years to come since any further coats of paints applied will stick to the latex only.
As long as the paints are the same chemistry, and as long as the existing paint has been cleaned to remove oxidation and surface contaminants, then there's no need for primer.
In addition to understanding the safety information, it will help you prevent any possible future damages to your surface. And remember, never apply oil paints over latex unless you are using a waterborne alkyd which will safely coat the more flexible layer beneath.
For those looking to paint over a latex-painted surface with oil-based paint, this means a thorough cleaning to remove any dust, grime, or oily residues which could impede adhesion. Following this, a meticulous sanding process to de-gloss and slightly abrade the surface will provide the oil-based topcoat a better grip.
Without primer, the paint absorbs into the surface unevenly, leaving an inconsistent finish with patched areas showing through the final coat of paint.
Peeling paint must be removed prior to applying a fresh coat of paint to ensure proper adhesion. For Best Results: Refer to the how-to for guidelines on removing peeling paint. Using a scraper or 100-grit sandpaper, remove any loose, cracked, or peeling paint from the damaged area.
Wipe the surface with acetone-free nail polish remover and if any colour comes off, this indicates it is latex paint. TEST IT: Wipe the surface with acetone-free nail polish remover and if nothing comes off, this indicates it is oil paint.
Oil-based paint will not adhere to your existing latex paint layer, so you need to create a middleman, of sorts. A thoroughly applied (2 coats is a good idea) primer, specifically formulated to bond with your new paint, will allow your new paint to bond to the wall properly.
If you have various stains, shellac Bonding primer is the ideal choice. It can be used to cover rough surfaces and old varnish as well as metal and ceramic.
Acrylic paint contains synthetic resin for enhanced adhesive qualities and elasticity, making it ideal for high-wear and outdoor surfaces. Latex paint, often based on polyvinyl acetate (PVA), is typically less durable but more environmentally friendly and suited for interiors.
So you cannot paint over latex paint with another layer of latex. Some folks recommend using a primer before painting it over with acrylic. But if you are going to paint play, you will have to sand it and prime it with an oil-based primer.
The truthful answer to this question is that you shouldn't paint an oil-based product directly over latex paint, but it can be done if a sealing coat is used to separate the layers.
Most projects where you're going over a previously-painted surface do not require the use of a primer. In many cases all you'll need to do is spot-prime any bare areas that need to be addressed before applying your finish.
A bonding primer or an oil-based primer is recommended for surfaces with peeling paint issues. Follow the manufacturer's instructions for the specific primer you're using. If there are any visible cracks, holes, or imperfections on the surface, use a suitable filler or spackling compound to repair them.
Cracked paint can be an eyesore, and can degrade the look and feel of your home. In short, yes you can paint over cracked paint, but it isn't as simple as one may assume. Whilst, you can simply paint over it with a coat of fresh paint, that isn't a guarantee the cracking won't return.
Flashing, or 'the halo effect', is when patches become visible on a painted surface in certain lights/angles. Flashing appears when two areas of a painted surface have been applied differently. In the example shown below, the wall was originally painted using a roller and has since been touched up using a paint brush.
When To Use a Paint & Primer In One. If you want to paint a wall that already has paint on it, and there won't be an extreme change in color or texture, then you are free to use a paint-and-primer-in-one because it can be useful for these scenarios. Paint-and-primer-in-one works on pre-painted surfaces.
Primer is formulated to bond well with the surface underneath, whether it's drywall, wood, or something else. However, paint sticks best to a primed surface rather than directly to the primer. If you leave primer unpainted and then decide to paint over it later, there's a greater chance of adhesion problems or peeling.
If the current wall is smooth, clean and covered with the same type of paint (both are oil-based for example), you can head straight for the paint. You need to fill holes, spackle and sand*, maybe even cut a new piece of drywall in to the existing wall.
Latex paints will not stick to oil based paints. The exception is that an oil based primer may accept any kind of top coat paint. For that reason, an oil based primer is recommended to be applied over any oil based top coat, then a water based paint may be used as a top coat.
Shellac Primer
They also are excellent at preventing normal water, rust and smoke stains, as well as wood tannins from bleeding through new paint. They work well on wood, metal, plaster, and even plastic, and are fast drying and highly adhesive. They also can be used with both oil-based and latex paints.
Use on interior and exterior surfaces including woodwork, drywall, plaster, paneling, masonry, brick, painted metal and properly prepared glossy surfaces†. Use under or over water-based or oil-based paints.