you should be able to coat the background with a thinned down quickcreat mixture. iv seen 3d bg done that way and they look like real rocks. if thats what you going for. then you can use ur fusion paint on the cement there are several vids on youtube showing ppl making there own 3d bg.
75gal 2 bala sharks,1glass catfish,3clown loaches 1of each,blue gourami,sun catfish,banjo catfish,giant asian upside down catfish,hillstream loach-10gal 6glowfish/blacklite