In conclusion, while it's possible to apply latex paint over oil-based primer, it requires proper surface preparation and the use of a latex primer. Never apply oil-based paint over a latex surface, as it will not adhere properly.
You can put water based/latex paint or primer over oil based. Its not recommended to do the other way around do the flex of the latex.
Yes, latex over oil base is fine as long as the oil base paint is 'dull' enough to allow good adhesion. Oil base over latex is not so good since latex paint is soft and will flex and oil base is hard and will crack.
After priming, allow to dry 4 hours, test a small area for bleeding by applying the topcoat before painting the entire project. If the stain bleeds through, apply a second coat of primer and allow to dry overnight and retest before topcoating. Use Multi-Purpose Latex Primer over solvent sensitive stains.
Acrylic/Latex paint will not adhere to oil based paint, unless you sand it down or use a latex primer that is 100% acrylic and has high adhesion. Or you can use an oil primer and then 48 hours later paint over that with a latex paint.
If the paint does NOT come off, it is oil-based paint and you will need to prime the surface with a bonding primer before applying latex paint. The primer can be latex, but it has to be a product that is made to prepare the surface and help with adhesion and that says “bonding” on the label.
This incompatibility when you paint latex over oil can lead to flaking, peeling and chipping of the paint job, which spoils the look and functionality of your DIY project.
Shellac Primers - These primers can be used with both oil-based and latex paints and may be the best at blocking stains and can even seal in smells that may be coming from the surface you are painting.
When the oil-based primer is completely dry, the surface may still have a few small imperfections. This is typical even if you are a pro. The surface may feel chalky or even slightly rough. Using a Sanding Sponge, lightly sand the entire surface.
Oil-based primers permeate wood more comprehensively compared to latex primers, making them ideal for getting ready weathered wood for painting. The best permeation is attained by a slow-drying primer, however, the price to pay is an extended wait period before doing the topcoating.
Rusty Metal Primer provides excellent rust prevention when top coated with lacquers or automotive enamels. For best results, top coat with Rust-Oleum Auto Paint. If using an auto lacquer, a test application for compatibility is recommended.
They are Sherwin Williams Extreme Bond Primer, and Behr Bonding Primer. These top two primers were the very best at bonding in both the 24 hour test and the 38 day test.
Best for use in
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. Not recommended on flooring.
Water-based primers work well on ceilings, interior walls, and exterior surfaces for new projects. On the other hand, oil-based primers offer better performance on surfaces that require more durability and stain-blocking capabilities.
An oil-based primer will readily cover and adhere to a latex under-layer. The problem however might be in how well the latex layer has bonded to the surface upon which it is painted. If that is not strong enough or it is already separating, or beginning to, both latex and oil paint will chip off.
It is called the Acetone test. If you have a can of acetone simply soak a rag or cotton ball and rub an area where you think oil paint might be present. If the paint softens or comes off on the rag it's latex if it stays hard and nothing happens it's oil based paint.
Sanding the primer before painting is not just a recommendation; it's a critical step in the preparation process for painting a car. Skipping this step can lead to a less than satisfactory finish and potentially compromise the paint's durability and appearance over time.
Natural bristle is the best choice for oil-based paints, varnishes, shellac, alkyd enamels, oil stains and oil-based polyurethanes. The highest quality bristles come from mainland China. Experienced, traditional painters will say there's nothing like the finish that a China bristle can provide for oil-based coatings.
Under optimal conditions, these BEHR® primers listed below are ready for topcoat after one hour. Once completely dry, apply one to two coats of the desired BEHR water-based topcoat. Allow two hours of dry time in between coats.
The oil-based paint will not adhere well to the latex surface, leading to poor adhesion and eventual peeling. To avoid costly mistakes, always choose the appropriate paint type for your project and follow the recommended guidelines.
It's ready to brush, roll or spray and can be topcoated after one hour with latex or oil-based paint. Use KILZ STANDARD Primer on almost all interior surfaces including wood, drywall, plaster, brick, masonry and more.
Primers perform best on new or bare surfaces. You will, however, want to use an alkyd primer over an existing alkyd enamel, if the new finish coat is latex. The alkyd primer will improve the adhesion of the latex finish coat.
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.
Water-Based Paint. While painting over oil-based paint with another oil-based paint will forego the extra preparation steps, it's better in the long run to use water-based paint.
High Exposure to Sunlight. Exposure to intense sunlight makes oil-based paints vulnerable to cracking. Elastic and latex paints tend to contract and expand when exposed to direct sunlight, which weakens their adhesive bonds.