Almost up to the finishing stages. Because I am using old boxes for these outside speakers [ but under shelter so not rained on] I need to paint them. The old plastic veneer is off and the build has a lot of cracks and the chipboard isn't in good condition. Has anybody ever used gesso to seal boxes before painting? If so do you have a recipe that uses Bondcrete PVA plus sawdust as part of the mix? Also rather than calcium carbonate as the filler has anybody used Plaster of Paris?
I don't want to spend too much more on these boxes than I have to but they will look a bit better with coat of paint
I don't want to spend too much more on these boxes than I have to but they will look a bit better with coat of paint
FWIW I used drywall mud, though recall the 'old-timers' used the plaster mix for making fancy room corner trim, 3D decorations on walls.
Depends on if you just want filler or repair and fill. For repair and fill, use epoxy with fumed silica, replace with talcum power if just fill. Epoxy used with these sands super easy and I can't think of anything else that will create a higher quality paintable surface. You also get good waterproofing with this approach