New Posts New Posts RSS Feed: Buoyant foam
  FAQ FAQ  Forum Search   Register Register  Login Login

Buoyant foam

 Post Reply Post Reply
Author
423zero View Drop Down
Really should get out more
Really should get out more


Joined: 08 Jan 15
Location: United Kingdom
Online Status: Offline
Posts: 1826
Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Topic: Buoyant foam
    Posted: 24 Aug 18 at 9:40am
Is their a buoyant foam available that doesn't take up water ?
Looking for something fairly rigid too and that can be shaped.
Back to Top
JimC View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 May 04
Location: United Kingdom
Online Status: Offline
Posts: 6174
Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 18 at 9:58am
Dow Floormate doesn't take up much water. I've used it for boats.
Back to Top
423zero View Drop Down
Really should get out more
Really should get out more


Joined: 08 Jan 15
Location: United Kingdom
Online Status: Offline
Posts: 1826
Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 18 at 10:06am
Would this stuff do ?

https://www.ebay.co.uk/sch/i.html?_sacat=0&_nkw=styrofoam+block&_frs=1

Would you be able to lay GRP straight on to this once you have required shape ?

Looking to increase buoyancy at stern of Sprint, intend to fill both sides of deck, going forwards approx' 18", will put 2 ports through to maintain drainage, with flaps to prevent water ingress.


Edited by 423zero - 24 Aug 18 at 10:33am
Back to Top
JimC View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 May 04
Location: United Kingdom
Online Status: Offline
Posts: 6174
Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 18 at 12:00pm
Dow Floormate is styrofoam, so basically yes. However there are an awful lot of grades of styrofoam, and when I researched it they seemed to vary greatly in the amount of water they take up. I'm not sure to what extent you can get spec sheets from ebay vendors or even trust them to send what the spec sheet says.

You can put an epoxy/glass layup on styrofoam, but I'm pretty sure polyester will reduce it to a sticky mess.

Edited by JimC - 24 Aug 18 at 12:02pm
Back to Top
423zero View Drop Down
Really should get out more
Really should get out more


Joined: 08 Jan 15
Location: United Kingdom
Online Status: Offline
Posts: 1826
Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 18 at 6:02pm
May try to deck over, I have access to sheets of glossy white GRP.
Have seen foam react, don't fancy spending hours shaping something to see it melt.
Back to Top
iGRF View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 07 Mar 11
Location: Hythe
Online Status: Offline
Posts: 5731
Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 18 at 6:21pm
Go down to the nettles in most clubs and you'll find an old sailboard or two, lots of them are filled with a good quality low density styrofoam. Mistral, F2, Fanatic are probably best of the old ones..
Back to Top
423zero View Drop Down
Really should get out more
Really should get out more


Joined: 08 Jan 15
Location: United Kingdom
Online Status: Offline
Posts: 1826
Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 18 at 6:45pm
Must have cut up 30 of these boards last time we had a skip, hardly any abandoned boats or anything else really, we have half a dozen large blue barrels full of sails and dozens of masts and booms.
Back to Top
Sam.Spoons View Drop Down
Really should get out more
Really should get out more


Joined: 07 Mar 12
Location: Manchester UK
Online Status: Offline
Posts: 2536
Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 18 at 7:42pm
The clue is in the name, "styrofoam/polystyrene". The solvent in polyester resin is 'styrene' and will dissolve styrofoam with extreme prejudice.

Also polystyrene (and polyester resin based gap) absorb water to varying degrees.

Most early high performance sailboards were constructed with epoxy and polystyrene when surfboards and early/lower tech sailboards used PU foam and polyester resin.
Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish"
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down

Bulletin Board Software by Web Wiz Forums® version 9.665y
Copyright ©2001-2010 Web Wiz
Change your personal settings, or read our privacy policy