Painting MDF can be a real chore. Especially trying to paint the edge of MDF. It just drinks up the paint and takes forever to seal. It seems everyone has a different method and recommendation when it comes to painting and sealing the edges of MDF so I thought I would put 9 of those methods to the test.
The MDF test pieces were all sanded to 240 grit before applying the different methods.
For the top coats of paint I used spray gloss paint. I chose this because I thought gloss would give the best comparison surface finish between each method. Using spray paint will remove issues like brush strokes and marks left by rollers. I used Rustoleum Mode paint which is actually recommended for MDF on the can.
Method: Iron & Blowtorch
The first suggestion was one I hadn't ever considered before. I was recommended to use heat to seal the MDF before painting. This came in the form of using an iron and a blowtorch. I tried the iron method on the left side of the MDF and the blowtorch was tested on the right side of the MDF.
The iron was set to its highest heat and the steam function was turned off. I applied heat evenly across the left side of the MDF edge. It felt smoother but I sanded it and applied the heat again. This made the edge feel silky smooth.
The blowtorch was used on the right side of the MDF edge. I applied the flame until the MDF was evenly scorched. After sanding it did feel smoother but I applied the blowtorch again for a second coat of heat. After sanding the second coat it felt silky smooth.
Cost: £0.00 (only cost being electricity which I can see being fractions of a penny)
Time To Apply: 2m 36s
Cost: £15.20 (full 0.4kg canister of gas)
Time To Apply: 24s
After applying 2 top coats of paint sanding between each with 240 grit paper I was really disappointed with the finish. Before paint the surface felt as though it had sealed but the paint just soaked in and made it feel rough again.
The iron side had a flat dull appearance and still felt quite rough.
The blowtorch side felt smoother than the iron side but it was still really dull. It wasn't a great finish.
Overall I would give both these methods 0 out of 5 stars.
Edge banding has been recommended by loads of people but I've never actually tried it myself.
Applying it was really easy. I cut it to length with scissors.
I could then use the iron to apply it to the edge of the MDF. It sets almost instantly.
There are specific trimming tools you can buy for edge banding but I just used a sharp knife and some sandpaper.