Thanks. Once the foam ('Great Stuff') is fully cured, it is inert. It will break down slowly if exposed to U.V. over time, but it is harmless. People have been doing this for years and found that if you use a good marine paint, it lasts. There is a really cool thread on reefcentral.com in the DIY section.
P.S. I ordered my custom Starfire euro 90 gal from Bow Valley Aquariums. WHOOOOOOOOOHOOOOOO!!!!!!!!!!
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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