fiberglass

[jmms1975]

Has anyone ever used fiberglass resin for rocks and water fall features , seems like it would be more lightweight just do`nt know if it would be toxic.

[beckdg]

looks like i may be wrong and that which particular product you choose may be where the importance lies... Another DIY Plywood Tank Article

then there's this... "The only sealer/coating that is qualified for use in an aquarium is a TWO PART EPOXY FOR POTABLE WATER TANKS. This coating is used to seal the interior of several thousand gallon community drinking water tanks, as a coating for holding tanks in fish farms and as a liner for large public aquariums. These coatings are NSF 61/USDA/ANSI/AWWA and FDA certified and approved. Further, epoxy coatings are highly resistant to salts and corrosion and are recommended for marine use."
from here... http://www.cichlid-forum.com/article..._aquarium3.php

[brbrandon]

I used West Systems 105 epoxy resin and 207 clear hardner. I spoke to West Systems tech. support on if their resin was "aquarium safe". As long as you mix correctly(get the pumps) and give 10+ days to cure it is 100% aquarium safe and fish are much more sensitive. I did use tile grout then epoxy resin. Take a look at my progress. There are updated pics on page 3. Its getting there.....