How to paint new door? Paint keeps peeling off

TomH1

My builder installed a new door then slapped a quick coat of paint on to weather proof it. I was on holidays. I can back to do the final coat and noticed some imperfections. Decided to sand before painting and the paint started lifting off like a skin off custard. Pulled the whole thing off, lightly sanded then repainted and now when I took the tape off the handles the whole paint layer starts lifting again and will need removal

. I am using Dulux Weathershield. I was told the door is pre-primed. What am I doing wrong? 

EricL

Hello @TomH1 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about the paint peeling off your door.

Since your door is already primed with an acrylic primer and you’re using a water-based paint, the issue likely stems from insufficient adhesion between the primer and the topcoat or inadequate curing of the primer before painting. To resolve this, start by stripping off all loose or peeling paint completely, using a scraper, fine sandpaper, or a gentle heat gun if needed. Be careful not to damage the primer underneath if it’s still intact. Once the paint is removed, clean the surface thoroughly with Sugar Soap or a similar cleaner to eliminate any grease, dust, or contaminants. Rinse with clean water and allow the door to dry completely.

Next, check the condition of the primer. If it appears glossy, lightly sand it with fine-grit sandpaper (e.g., 240 grit) to dull the surface and provide better adhesion for the paint. After sanding, wipe down the surface with a damp cloth to remove dust. Before repainting the entire door, test the paint on a small section to ensure it adheres well to the primed surface. Allow the test area to dry thoroughly and check for any lifting or peeling. When repainting, apply the paint in thin, even coats, ensuring not to overload your brush or roller. Thick coats can cause peeling and are harder to cure properly. 

Allow each coat to dry completely before applying the next, following the drying times recommended on the paint label.

For taping areas like handles, use a low-tack painter’s tape such as ScotchBlue™ Painter's Tape to avoid peeling the fresh paint when removing it. Carefully remove the tape at a 45-degree angle, either while the paint is still slightly wet or as soon as it dries, to prevent lifting. Additionally, make sure to allow the final coat of paint to fully cure before subjecting the door to heavy use or applying tape again. While water-based paints may feel dry within a few hours, they can take up to two weeks to fully cure.

Lastly, consider environmental factors like humidity and temperature, as these can significantly affect drying and curing times. Ensure the area is well-ventilated and at an optimal temperature as indicated on the paint label. If you continue to experience adhesion issues, it may be worth switching to a paint designed specifically for use with acrylic primers. By following these steps, you should achieve a smooth, durable finish that won’t peel or lift.

If you need further assistance, please let us know.

Eric