I have some raw MDF shelving that I'd like to paint. The shelving might be subjected to some heavy/sharp items or oily items, so I need something that is durable and won't bubble up when oil is spilled on it.
As the other (so far) responder says, use a primer first. I'd suggest that a latex enamel will be perfectly adequate as a finish coat for most any application. For cleanup and durability, I'd recommend a gloss finish.
Not really. Primer is designed specifically to have the proper surface adhesion properties for the following topcoat. Paint isn't intended to serve nor function as a stain. Use the proper primer for the surface and the selected topcoat.
Polyurethanes have it all over other coatings for abrasion resistance. Since adhesion is not an issue with polyurethanes, simply thin the first coat for penetration and apply second coat normally. System gives excellent rsults on MDF with a $20 spray gun from HF and would likely do just fine with a Wagner Whoopee Sparayer. HTH
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