Bill told me that it's just of the shelf PU foam you buy at Home Cheapo. The kind used for insulating windows and cracks.
You can now buy non expanding kind and also Crappy Tire has a grey version as well, according to Bill.
__________________
Denis
150g SPS reef;3x250WHQI,Tunze Streams,Wavebox,Neptune Apex,fishroom in basement  ,reefing since 93,SPS since 99.
TOTM June 2010
|