I have had an idea!
I have a very nice Avon Dinghy, although 15 years old it has no patches etc but it is still too nice to leave chained to a Pontoon 24/7.
Rather than bringing the dinghy back and forth from home every trip I need something to "float" across a very sheltered harbour and be able to leave on the mooring and chained to a pontoon 24/7.
For a previous boat I had a very cheap plywood pram dinghy which did the job, but I sold this with the last boat (and kept the Avon!) - the only problem with the pram dinghy was that after many years with Avons I did find it rather a tippy b#gger, I never fell in, but I had my "moments"!!
My options are:-
1) Another cheap pram type dinghy - too "tippy"
2) A plastic dinghy with built in buoyancy - hard to get cheap S/H
3) A cheap s/h inflatable - they require frequesnt (ish) pumping up (especially cheap s/h ones!) and keeping them afloat 24/7 doesn't do them a lot of good.
My idea is to get a very very cheap small s/h inflatable dinghy, doesn't matter if it only holds air for less than 5 minutes and has more patches than a quilt or more holes than a sieve, because...............I am going to fill it full of foam!
My questions are, has anyone done this? Would the usual expanding foam react with the Dinghy "rubber" (ie does it contain chemicals that would "eat" the rubber?). I was also thinking of coating the Dinghy with some form of Epoxy or similar (on the basis that anything I buy will probably not be water (air!) tight, and I know you gotta keep the foam dry).
I am not sure whether I patch the dinghy first, then coat it with epoxy and then fill with expanding foam (i figure this was way would give me a bit of "leeway" in case I over fill it!). Or fill it with expanding foam first, then epoxy it.
Perhaps this is not the cheapest route and the resulting "creation" may not win any beaty contests, but as long as it does the job I will put any resulting ugliness down to a cunning anti theft device!
Any thoughts / words of wisdom (I have not used epoxy or expanding foam before).