Aerosol foam will not last very long.
– Last Updated: Sep-15-04 3:30 AM EST –
The idea is solid though..... gotta use the better marine type foam, even this stuff has better grades. Generally available in 2 lb densities and up..... 2 lb will not last long either unless you glass over the WHOLE thing , not just the top or bottom. Will support the weight o.k. but cannot take much movement before it starts to break down. 4 pound foam will hold up fine if glassed over w/ glass taking the load and foam only acting as core. 6-8 lb will work as just a seat without major reinforcement but now consider the 6-8 pounds per cubic foot part. Bottom of boat shape is there on seat, from your sit on it process now lay some glass over it (seat bottom) neatly and cover w/ 4 mil plastic to get a really smooth, no sanding needed finish..... lay some resin and cover w/ same 4 mil plastic to get a smooth surface there to ( assuming it is not already) in hull of boat where seat will be... With the smooth surfaces now velcro strips will stay stuck and allow you to move seat around once in a while if you need / want to. Suggest using only half width of the hooks and place on hull, use the full width of the loops and place on seat bottom.
Anyone ever look under a motorcycle seat's cover? That foam is available in 2 part too and really makes a trick seat. It's flexible foam instead of rigid. Better to have smooth cavity molds though because the skin that gets formed against the mold faces is what gives it it's strength.... cannot really shape it like minicell.
Forgot to mention to anyone contemplating sitting on a bag full of rapid cure foam... HEAT !!! Better to do in small batches unless one is really masochistic(sp?). Also suggest wearing a wetsuit to insulate from said overheating and get a nice shape.