A: Before painting over varnished wood, ensure thorough cleaning by using a mild detergent and water solution to remove dirt and grease. Sand the surface lightly to create a suitable texture for paint adhesion. Apply a quality primer to enhance paint durability.
You can paint over varnished wood as long as you use the right materials and painting process. The best paint to use is a water-based acrylic one. If you're using an oil-based paint only use an oil-based primer, not an acrylic one.
Many people believe you can't paint over varnished wood. This however is false. In order to paint over it you will need to use either oil or water-based paints. However, it the process is time consuming and you will have to complete all the steps if you want it to look professional.
It is generally not recommended to paint over varnished wood without sanding or priming first. Sanding ensures the paint adheres properly, while priming helps with paint coverage and durability. Skipping these steps can result in peeling or chipping paint.
We recommend using Zinsser Bulls Eye 1-2-3 for glossy surfaces like varnished wood. Zinsser Bulls Eye is a 'bond coat' primer that's great for hard-to-stick surfaces as it offers excellent adhesion without sanding.
Choosing The Right Primer
Even though oil primer smells bad and can be messy to work with, it's the best option for painting over polyurethane because it soaks into wood to form a seal without raising the grain like a latex primer would.
Zinsser BIN
This is a shellac-based paint designed to stick to difficult surfaces like varnished wood.
Oil-based paints will adhere to the primer and polyurethane surface best and will last longer than water-based paints. Open your can of paint and use a paint stirrer to stir it well.
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.
All in all, as long as you are only touching up small areas with acrylic paint, then it is perfectly fine to paint over a varnish acrylic painting. I've done it a few times myself with no problems!
Before painting over a varnished surface, it's essential to dull the sheen level of the gloss with 120-grit sandpaper and then apply a specialty primer like Dulux 1L PRECISION White Maximum Strength Adhesion Primer that is designed for difficult-to-paint surfaces.
This often results in an unsightly and uneven finish. However, with adequate preparation, such as cleaning, sanding, and priming, you can effectively paint over varnished wood. Proper prep ensures the new paint bonds well to the surface, giving you a smooth and long-lasting finish.
Latex paint is the most popular type of paint for wood. It's easy to use and dries quickly, making it a great choice for beginners. It's also inexpensive and available in a wide range of colors. It's not as durable as oil-based paint, so it's not the best choice for high-traffic areas or exterior surfaces.
By far the best results we have had and this is now our go-to product is Tikkurila Otex. It has good opacity so blocks the colour of dark varnish very well, it is fast drying so can be painted over very quickly in just over an hour.
For bonding rigid PU, we recommend using polyurethane adhesives such as Araldite 2018 and Araldite 2028-1 and structural acrylics; Permabond TA4204.
If you don't invest time in sanding, your paint over polyurethane project won't be a success.
Zinsser BIN is shellac-based, whereas 123 is water-based. This makes Zinsser Bullseye 123 a lot quicker and easier to apply. It's also better suited for use on bare wood, or to prime plastic and composite before painting. BIN may be harder to apply, but it is by far the better stain block.
To paint over gloss with emulsion paint, you will have to use a super grip primer to prepare the surface. If you are painting over a glossy surface with another coat of gloss, satin or eggshell paint, you can lightly sand and clean the surface and paint it without having to use a primer.
Yes, The Zinsser BIN Primer can be painted over.
Applying a primer to your polyurethane finish is essential. Other types of primers are less compatible with the polyurethane finish, which leaves you with an oil-based primer for the best results. An oil-based primer is the only type of primer that is compatible with your polyurethane finish.
Use it on interior and exterior surfaces and topcoat with almost any type of coating including Alkyd, Acrylic Latex, Urethane, Epoxy, and Lacquer Finishes. Stix levels to a smooth surface and cleans up with soap and water. Not recommended for use over polyethylene or polypropylene.
We recommend you use the MP-2K Urethane Primer. It has very easy to sand properties, high build and cures fast. Mixes 4:1 with activator and does not need reducer.