You should also make sure that you wear eye protection and a face mask. Sanding mdf will allow the primer and paint to bond well with the surface.
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Then apply preferred sealer polyurethane lacquer wax etc if you expect your mdf project to get daily use in order to preserve your paint job.
How to seal mdf for spray painting. Seal the edges with drywall putty to ensure a consistent coat when painting medium density fiberboard. For example painted cabinet doors could benefit from an extra layer of protection from wear and tear. After the surface has been sealed with something ese though a water based paint will not affect the mdf adversely.
Im making bookcases and want to paint them with latex paint they are made of mdf board. I definitely recommend that you use a primer sealer prior to painting mdf. Unprimed mdf needs to be primed with a water based primer.
Because mdf is a wood composite its very porous. Sanding sealer is routinely sprayed into cabinets before they are installed and on raised panel doors before they are painted to add protection. As a tole and decorative painter i like to use a brush on acrylic polymer such as gac 100 by golden for priming and sealing.
Mdf crown molding on the other hand. I use latex paint over properly sealed wall paneling and trim molding but for painted furniture or cabinets i prefer the finish quality of oil or lacquer based paint that is applied with a spray gun. Anon54727 all the gluewater mix does is seal the mdf you should do this if it is raw mdf.
Then sand apply a primer sand and then apply the topcoat paint. Seal mdf edges which are the most absorbent. Work up to a light grit sandpaper that will polish off your mdf.
As with all mdf all edges should also be sprayed with sanding sealer. When you sand mdf you need to make sure that you are in a fully ventilated room. It has a dense particle load that builds quickly on the surface of the mdf to protect it from moisture.
Sealing mdf with pva glue to seal the edges or flat surfaces you can spread or spray a layer of thin pva white or carpenters glue over the edge with a glue spreader or a pump spray bottle or air brush making sure the glue layer is as even as possible with no build up at the edges. Allow paint to dry thoroughly.
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