Model Boat Mayhem

Please login or register.

Login with username, password and session length.
Pages: [1]   Go Down

Author Topic: re hull making a question  (Read 2191 times)

slug

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 425
  • Location: newark notts
re hull making a question
« on: May 31, 2011, 07:40:29 pm »
the other week i went to a place that made plaster and fiberglass fireplaces it made me wonder if a shape of the was made out of foam could this be put in a box and filled with moulding plaster when the plaster is dry remove hull and you end up with a mould fo making a fiberglass hull  just a thought if it worked it could be a quikish way of making a hull etc  slug
Logged

Bryan Young

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 6,883
  • Location: Whitley Bay
Re: re hull making a question
« Reply #1 on: May 31, 2011, 08:12:32 pm »
Sounds like a pretty expensive way of doing it. Not that making a GRP hull is ever going to be "cheap". How were you thinking of getting the foam "plug" smooth enough to get a decent finish on the mould? Could "plate" it I suppose. Seen the price of a small bag of Plaster of Paris recently? How much do you anticipate the weight of the mould to be? many questions here.
I experimented with P of P moulds for the lifeboats on my model of "Gold Ranger". Never again! BY.
Logged
Notes from a simple seaman

slug

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 425
  • Location: newark notts
Re: re hull making a question
« Reply #2 on: May 31, 2011, 08:32:18 pm »
by they were using commercial plaster like a thin custard from british gypsum powder went off in 10-15mins just an idea thanks for your thoughts   tony
Logged

nemesis

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,088
  • Location: North Shields. Northumberland
Re: re hull making a question
« Reply #3 on: May 31, 2011, 10:59:15 pm »
hello, The plaster in question is called "herculite" super fine & white, setting time I know not. The setting time for fresh surgical plaster is about 15 mins, it gets quicker as it gets older. Dental plaster is about the same but with a  more coarse texture. The times given assume the correct plaster/water ratio. If you go down this route you have to seal the plaster with a few coats of shellac & even with your separator you may still bind on in places.   Nemesis
Logged

rmaddock

  • Guest
Re: re hull making a question
« Reply #4 on: June 01, 2011, 11:50:49 am »
I gather from this forum that the "norm" is to make a positive hull blank from foam or balsa or some such and then make a GRP mould from that. You then cast the real hulls inside the GRP mould.  I've no idea if this would be cheaper than plaster though.
Logged

nemesis

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,088
  • Location: North Shields. Northumberland
Re: re hull making a question
« Reply #5 on: June 01, 2011, 10:49:24 pm »
Hello, It would be cheaper in the long run, the results would be better too. Been there & got the proverbial, Stick with Glassfibre.
                                                                Nemesis
Logged
Pages: [1]   Go Up
« previous next »
 

Page created in 0.03 seconds with 21 queries.