I've never heard of anyone doing this but I like the idea of lake recovery as long as you have a boat standing by to make a quick recovery and you test the idea to see how well a rocket would actually float. You might need to add a flotation device to your recovery system to make sure you don't lose the rocket.
Originally Posted by brywisco
Instead of paint you might try waxing the glider. That might be lighter than paint. Adding a lot of weight to boost gliders can be problematic to say the least. You could also paint the outside of a boost pod and then apply a coat of Future acrylic floor wax to the outside and inside. That might seal the cardboard enough that little or no harm would be done before you could recover the rocket - which I would try to do as quickly as possible. Still, I'm not sure this will work so you might test it with a cardboard tube and see how it goes.
One thing you will have to worry about is the engine casing. Those are wrapped paper and you likely wouldn't be able to seal the entire thing and still get it into the engine mount. But I would at a minimum seal the ends of the engine. I'd also try to get the casing out of the rocket after launch as quickly as possible. If it swells in the water you might not get it out of the engine mount without ruining your rocket.
Sounds like an interesting problem that might just be doable.
It's a very sobering feeling to be up in space and realize that one's safety factor was determined by the lowest bidder on a government contract.
— Alan Shepherd
I may be drunk, Miss, but in the morning I will be sober and you will still be ugly.
-- Winston Churchill