My question pertains to stains, primers, sealers, etc.
I "rescue" old pieces of furniture, spice racks, coat racks etc. and
give them new life as painted works of art with acrylic artists
paints. These are not antique pieces and most of them are discards
from flea markets, etc. I have an old coffee table which I need to
prime before painting it.
It appears that this piece has a brownish shellac finish and through
it's lifetime has had the top sanded down and subsequently pen and
marker graffiti written on it. The sides and legs are not sanded.
Since I am not attempting to preserve a quality piece of furniture,
priming over all manner of nastiness is the preferred method.
As a primer I applied a coat of Zinssers Primer Sealer Stain-Killer
Bulls Eye 1-2-3 to the entire table. It has worked wonders on past
projects - metal or wood. The sides and legs - which have not been
previously sanded - turned out fine. The previously sanded top
started to leach through brown stains in several places. I applied a
second coat of Zinssers and when dry, the leaching continued. I
applied methyl hydrate (denature alcohol) to the dry, painted surface
and sure enough the brown stains started to run through again. The
primer was fine. After wiping off the brown drips and reapplying
the methyl hydrate several times, it seems evident that there is no
end to the amount of brown leaching coming through.
As I will be undoubtedly coming across other similar old pieces, is
there a way to seal, deactivate, prime or in some way neutralize the
old shellac before starting to prime? Is there something I can do to
this already primed piece which will eliminate the brown leaching?
Would a coat or 3 of varethane be an effective sealer - after which I
can put more primer on top of the varethane?
Thank you for any insite.