Project Specifications: The Recital Hall and Recital Salon specified red acid
stain and the Gates Theater specified black acid stain. The mottling achieved
with acid stain was very important to the architects.
Challenges: The three concrete floors being stained
were all sloped toward the stages so all liquids would
run down hill. The Gates Theater had four levels. The
top three had terraced seating so the floor stepped down
with each row. The stage level had 440 six inch diameter
holes leading into a drywall lined ventilation duct.
No moisture could be allowed to go down these holes in
Solution: Spraying techniques were modified for the
two recital areas to minimize stain flowing downhill.
In the Gates Hall, we recommended using epoxy instead
of acid stain due to its higher viscosity. We used small
plastic buckets to fill and seal the holes during cleaning
and prep. The black epoxy was applied using a technique
that reproduced the look of acid stain mottling. This
process used much less liquid and achieved the desired
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