Actually there is a difference between Aquarium silicone and the regular stuff. Aaquarium silicone releases ethanoic/acetic acid(viniger) as it sets while normal silicone releases ammonia and methanol, the normal stuff also sets faster.
not true, sorry. the difference is simply in the curing agent, the effectiveness or where you use it is not affected. try a caravan or boat shop/dealer. high modulus silicone in 310ml tubes goes for £3.99, only the clear is aquarium safe though. i believe the company name is Hodgson sealants and it is sold as Hifix HM sealant. it works fine, takes 48 hours to cure, lol not a second longer. i just wish they did it in black. i am told hot glue, from one of those guns works well though too.
Hi all and thanks ever so much for all youre advise ... one thing I did do thinking it would be easier is get the Glue gun and the white stivks (Loctite) in the UK
I spent all day and sorted loads of these caves out only to put them in the water and they DO NOT STAY PUT the glue just disolves, wether this is because I am using slate I dunno ... Just a word of advise really .. I was a bit P'eeed.... LOL
So gone back to the good old £10 sealant .. hmmph..