I have switched to SeaAlu by Jotun - now it only comes in 20lt containers but there is enough for two seasons. It costs around £240 and only comes in blue, red or black. I have used both Trilux and SeaAlu and got a better performance from the SeaAlu.
See here http://www.jotun.com/www/uk/20020178.nsf...0256E62005E4187