I just finished my greenhouse. I painted the interior bare plywood walls with kilz brand of stain killer. Will a stain killer present any kind of a problem in this closed environment, or should I paint over it with a latex paint?
Certified GKH Gardening Expert
If you want the look of the natural wood, then you could go with a clear sealant (which will help guard against moisture from humid conditions inside greenhouse). Most people go with the latex paint option, however, adding an oil-based, bare wood primer with stain-blocker - followed by "exterior" latex enamel. I have also heard (though unsure of its effectiveness) that adding a few drop of vanilla extract in the paint will help inhibit mildew. You could always ask about this whenever you get your paint. The main thing is to go with something that will not be affected by the humidity, which could warp the walls.