Can I Paint Straight Onto Filler. The drying process can take up to six weeks. Just remember the easy fill will sink in any big holes though and may need refilling.
If you just slap on neat paint it'll dry instantly and sit on the surface and won't bond properly. You will have to wait at least four hours for the primer to dry before painting. If necessary, sand down when fully dry.
If you are planning on using the hardboard for art then do use an undercoat.
Take your time and make sure the primer coat doesn't drip or bleed on to any other part of the surface. If it is a solid concrete slab you are referring to then yes you can paint it. The drying process can take up to six weeks.
Also, can i paint straight onto filler?
Varnish doesn’t allow the paint to adhere correctly. Yes, you can paint straight onto hardboard. Keeping this in consideration, can i paint straight onto filler?
You`ll get lines in the filler.
Older walls are more likely to have accumulated some defects that need to be corrected before the actual painting process can begin. It also takes a while to dry if the holes are deep. Painting directly onto pb is fine (as long as those joints are invisible) mist coat filler joints then 2 top coats of emulsion and ur done the choice is yours diydave.
When you paint over filler you should apply a watered down coat of paint first or a plaster primer.
Can i paint straight onto filler? Can i paint straight onto new plaster? If necessary, sand down when fully dry.
We recommend that all paint be removed where filler is to be applied.”
There cheap and will do the job ok. Additionally, do you need to undercoat filler? At some point, when fixing hail damage or similar dents, the question, can body filler / bondo be applied over paint? will arise.