If you’re a homeowner looking to update your space, you might be wondering about changing your paint color. But what about old, oil-based paint? Can you paint over it with latex paint?
You can paint over oil-based paint with latex paint. However, to ensure that the new latex paint adheres well to the surface, you must sand, clean, and prime the surface. Skipping or rushing any of these steps may result in poor adhesion, leading to peeling, chipping, and even cracking of the new paint.
In this article, you will learn:
- The 3 factors to consider before painting over oil-based paint with latex
- How to paint over oil-based paint
3 Factors to Consider Before Painting Over Oil-Based Paint With Latex
Before you rush into painting over oil-based paint with latex paint, here are some key factors you need to consider to ensure a successful and long-lasting paint job.
1. Surface Preparation
Surface preparation is crucial before painting over oil-based paint with latex paint. The surface must be clean, dry, and free of loose paint or debris.
Before painting, clean the surface with a mild detergent solution, rinse, and dry completely. Lightly sand with fine-grit sandpaper to roughen the old paint for proper adhesion. Fill any cracks, holes, or gaps with an appropriate filler.
2. Temperature and Humidity
The temperature and humidity also affect the drying time and adhesion of the paint. Avoid painting on surfaces that are too cold or too hot, as extreme temperatures can cause the paint to not cure properly or take longer to dry. Similarly, high humidity can cause the paint to dry slowly and result in a dull, sticky finish.
3. Compatibility
Oil-based paint and latex paint are not compatible, which means they don’t adhere to each other. If you want the new paint job to last, you need to do an additional step of priming the surface with a primer that is specifically designed for oil-based paint. This will ensure that the new paint adheres properly and lasts for a long time.
How to Paint Over Oil-Based Paint With Latex
The following is a step-by-step guide on how to paint over oil-based paint with latex paint. Keep in mind that this process may take some time, but with patience and attention to detail, you can achieve a beautiful finish.
Tools and Materials
- Latex paint
- Oil-based primer or de-glosser
- Sandpaper (220 grit or higher)
- Paint roller or brush
- Paint tray
Step 1: Prepare the surface
Begin by thoroughly cleaning the surface you will be painting. Remove any dirt, dust, or grease using mild detergent and water. Once clean, dry the surface with a clean towel or let it air dry.
Step 2: Remove Chips and Cracks
If there are any chips, cracks, or other imperfections on the surface, repair them before painting. Fill any holes with a suitable filler and sand down any rough areas to make the surface as smooth as possible.
Clean the surface once again. If the area is still dirty and greasy, use TSP (trisodium phosphate) to remove any residue.
Step 3: Help the Paint Bond to the Old Layer
Before you paint, you need to either sand, de-gloss, or apply an oil-based primer. This will help the latex paint bond better to the older layer and ensure a smooth finish.
Option 1: Apply Oil-Based Primer
When it comes to painting over oil-based paint with latex paint, using an oil-based primer is the way to go. You may be tempted to skip the primer, but oils bond well to other oils, and an oil-based primer provides an excellent base for any paint.
Applying primer also provides a smooth base, making it easier to apply the paint over the surface. Once you prime with oil-based primer, you can top coat with either oil paint or latex paint without any issues.
Option 2: Sand the Surface
If you don’t want to use an oil-based primer, the other option is to sand the surface. Sanding lightly with 220-grit sandpaper will create a rough surface that the latex paint will adhere. Be careful not to over sand, however, as this can damage the original paint job.
Option 3: Chemical De-glosser
De-glosser is a product that removes the shine from a surface, making it easier for the paint to adhere. Apply de-glosser to the surface with a clean cloth and let it sit for the recommended amount of time.
Follow the manufacturer’s instructions carefully to avoid damaging the surface. Once the de-glosser has worked its magic, rinse the surface with water and let it dry completely.
Step 3: Apply Paint
Now it’s time to apply the latex paint. Pour the paint into a paint tray and use a paint roller or brush to apply a thin, even coat to the surface.
Be sure to follow the manufacturer’s instructions regarding drying time and recoat time. The number of coats needed will depend on the color and condition of the oil-based paint.
Step 4: Let it Dry
Allow the paint to dry completely before touching or using the surface. Follow the manufacturer’s instructions regarding drying time, but it’s always a good idea to wait at least 24 hours before using the surface.
Step 5: Clean Up
After the paint has dried, clean up any tools and equipment used during the painting process. Use soap and warm water to clean brushes and rollers, and properly dispose of any used paint or paint cans according to local regulations.