Re: Beer coating
did you let it dry long enough? until the silicate got rock hard?
i once put a dash of waterglass on a sheet of glass, out of curiosity.
it took some time (can't remember exactly i think it was overnight, so
at least a few hours) to dry, but afterwards it was hard as glass and
it got very brittle over time (a few days) and then came off again.
Loris Medici schrieb:
I tried beer coating tonight on a thoroughly cleaned and dried plain
aluminum sheet. Unfortunately the coating washed away in the cold water
bath. What could I have done wrong?
1. I opened a can of Pilsener and let it sit in the fridge for 24h
2. I took 100ml of the can and waited to normalize to room temperature (21C)
3. I mixed 1g of caustic soda (NaOH) into the beer
4. I mixed 10ml of sodium silicate into the beer
5. I stirred thoroughly
6. I immediately brushed the mixture onto a clean sheet of aluminum using a
7. I dried using a hair dryer in the middle setting
8. For the sake of getting an even primer coating, I coated the sheet once
more with the primer
9. Same as 7
10. I washed the sheet gently rocking a tray
The coating dissolved and left the sheet during step 10. BTW, FWIW, when
you put the sheet into water you can hear a fizzing sound (but can't see
Thanks in advance,
P.S. I couldn't manage to coat the Forex sheet with beer + silicate.
P.S.2. If I can't make it work, will try to put plain acrylic gesso (which
doesn't hold gum by itself) on the sheet, sand and then coat it with beer
P.S.3. I prefer to be able to coat the sheet w/o any acrylic gesso since I
plan to buy white painted (enameled?) aluminum sheets later -> I just want
to skip the whitening step for relatively conventional photographic