Vinny. IMO "Drylox" is great stuff. It is designed for concrete sealing and is safe for ponds too.I did three months worth of research be for I started my design. It is a extremely low odor latex base that dries to touch in 1 hr. I gave it a full day between coats. I used it in my living room although a shop would have been better.. I am using it on my Styrofoam rockets as well. It is tint able if you buy the white base. I got them to mix me a light grey/brown colour and fro there I plan on taking small amounts and darkening this colour with acrylic paints. Once I am happy with all the colours I will do the final coat in their "clear" one, it is guaranteed Water proof and Fish safe. There are some good demos on you tube so you can check it out. Here is one of a fish tank background to prove it is safe and waterproof > https://www.youtube.com/watch?v=lyKd06sHjJQ Hope that helps Vinny.