Model Boat Mayhem

Please login or register.

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

Author Topic: Repairing / strengthening Hull  (Read 7372 times)

Cragrat

  • Shipmate
  • *
  • Offline Offline
  • Posts: 7
  • Model Boat Mayhem is Great!
  • Location: KNARESBOROUGH, North Yorkshire
Repairing / strengthening Hull
« on: February 28, 2016, 08:52:03 pm »

Hi All,  I am after a little advice on how to strengthen/fill some thin areas on the hull of my Caldercraft Puffer?  As you can see from the attached picture you can almost see daylight through some sections!

Any advice on how what to use and suppliers gratefully received.   :-))

Thanks,
Logged
Built:- Club 500, Caldercraft HMS Orestes (Mars as they call it.)
Building:- Aeronaut Ramborator, Caldercraft Puffer Northlight & Caldercraft HMAV Bounty
On the bench:- Caldercraft HMS Snake, HMS Endeavour.

Crossie

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 234
  • Model Boat Mayhem is Great!
  • Location: Norfolk UK
Re: Repairing / strengthening Hull
« Reply #1 on: February 28, 2016, 09:19:17 pm »


  My approach would be to abrade it with some 80 grit and then use epoxy resin and glass bandage or woven cloth. Epoxy will bond to the cured polyester/chopped strand mat of the hull much better than polyester resin would.


           Trevor
Logged

Cragrat

  • Shipmate
  • *
  • Offline Offline
  • Posts: 7
  • Model Boat Mayhem is Great!
  • Location: KNARESBOROUGH, North Yorkshire
Re: Repairing / strengthening Hull
« Reply #2 on: February 28, 2016, 09:50:14 pm »

Thanks Trevor for the advice there.  What weight of cloth would you recommend, I have not used fibre cloth for repairs before, I am guessing it doesn't have to be some thick mat?
Logged
Built:- Club 500, Caldercraft HMS Orestes (Mars as they call it.)
Building:- Aeronaut Ramborator, Caldercraft Puffer Northlight & Caldercraft HMAV Bounty
On the bench:- Caldercraft HMS Snake, HMS Endeavour.

Subculture

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 4,187
  • Location: North London
    • Dive-in to Model submarines
Re: Repairing / strengthening Hull
« Reply #3 on: February 28, 2016, 09:53:10 pm »

To be honest that small bit of area could just be filled with some unreinforced two part epoxy, like araldite
Logged

essex2visuvesi

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 6,148
  • Location: Finland, England, Finland!
Re: Repairing / strengthening Hull
« Reply #4 on: February 28, 2016, 09:57:06 pm »

Ive used this with excellent results



Just put s a few strips over the area and then cover with a layer of expoxy
Logged
One By One The Penguins Steal My Sanity
Proud member of the OAM  (Order of the Armchair Modeller)
Junior member of the OGG  (Order of the Grumpy Git)

Crossie

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 234
  • Model Boat Mayhem is Great!
  • Location: Norfolk UK
Re: Repairing / strengthening Hull
« Reply #5 on: February 28, 2016, 10:11:30 pm »


 Pretty much any weight of cloth would do except tissue, anything just to provide some structural filaments to bridge the gaps left by the poor quality lay-up, while applying unreinforced epoxy would probably suffice as Subculture suggests, I just have a tendency to apply technical fixes!
       The fibreglass tape posted up by essex2visuvesi is an excellent idea, readily available and much used in the model aircraft world for reinforcement, get it from a builders merchant/decorating supplies as it's used along plasterboard seams.

                     Trevor
Logged

essex2visuvesi

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 6,148
  • Location: Finland, England, Finland!
Re: Repairing / strengthening Hull
« Reply #6 on: February 28, 2016, 10:21:40 pm »

Its also self adhesive so tends to stay where you put it
Logged
One By One The Penguins Steal My Sanity
Proud member of the OAM  (Order of the Armchair Modeller)
Junior member of the OGG  (Order of the Grumpy Git)

Stavros

  • Guest
Re: Repairing / strengthening Hull
« Reply #7 on: February 28, 2016, 10:35:38 pm »

Personally I would simply use some P40 bridging filler and smear it on with my finger to just cover the affected area....you will need some for fixing the shaft if you are not using epoxy

Dave
Logged

Cragrat

  • Shipmate
  • *
  • Offline Offline
  • Posts: 7
  • Model Boat Mayhem is Great!
  • Location: KNARESBOROUGH, North Yorkshire
Re: Repairing / strengthening Hull
« Reply #8 on: February 29, 2016, 07:05:36 am »

Thanks all for your replies, think I will get some of that tape as holding the hull up to the light there are three areas of thinning and holes. 


Thanks again
:-))
Logged
Built:- Club 500, Caldercraft HMS Orestes (Mars as they call it.)
Building:- Aeronaut Ramborator, Caldercraft Puffer Northlight & Caldercraft HMAV Bounty
On the bench:- Caldercraft HMS Snake, HMS Endeavour.

martno1fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,472
  • Location: Blackpool
Re: Repairing / strengthening Hull
« Reply #9 on: March 08, 2016, 07:32:03 am »

Id just use poly resin and chopped mat thats what its made of exept they used the cheaper white coloured resin rather than clear,you can buy a repair kit at halfords with everything you need,just tear off a thin layer of the mat,it comes thick around 600 g but can be split quite easilly to thinner pieces,id do the whole hull inside with one layer and enough resin to wet it out fully job done.Or you can just repair the thinner parts you showed if you wish . Reason i know its poly is you dont usually use chopped mat with epoxy as most mat has a binder to hold it together that epoxy wont break down.Get yourself some acetone or you can use the wifes nail varnish remover  ;) easier to get locally than acetone lol and first use some 80 grit paper to rough up the inside then clean away the debri,then clean the whole inside with acetone on a cloth prior to brushing in your mixed resin,then apply your mat ,tear the mat dont cut or any overlaps will be visible and not fully incorporated into the other ,wet out your mat with a brush and more resin untill fully wetted out NOT OVER WET or it will get heavy pretty quick,be careful to follow mixing chart on the tin.Hope this helped.
Mart
waveridermouldings
Logged

JimG

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,268
  • Model Boat Mayhem is Great!
  • Location: Dundee
Re: Repairing / strengthening Hull
« Reply #10 on: March 08, 2016, 11:15:07 am »

Get yourself some acetone or you can use the wifes nail varnish remover  ;) easier to get locally than acetone lol and first use some 80 grit paper to rough up the inside then clean away the debri,then clean the whole inside with acetone on a cloth prior to brushing in your mixed resin.
Mart
waveridermouldings

Nail varnish remover often contains oils which are good for your nails but not for cleaning before glassing.

Jim
Logged
Dundee Model Boat club

Cragrat

  • Shipmate
  • *
  • Offline Offline
  • Posts: 7
  • Model Boat Mayhem is Great!
  • Location: KNARESBOROUGH, North Yorkshire
Re: Repairing / strengthening Hull
« Reply #11 on: March 08, 2016, 09:46:00 pm »

Id just use poly resin and chopped mat thats what its made of exept they used the cheaper white coloured resin rather than clear,you can buy a repair kit at halfords with everything you need,just tear off a thin layer of the mat,it comes thick around 600 g but can be split quite easilly to thinner pieces,id do the whole hull inside with one layer and enough resin to wet it out fully job done.Or you can just repair the thinner parts you showed if you wish . Reason i know its poly is you dont usually use chopped mat with epoxy as most mat has a binder to hold it together that epoxy wont break down.Get yourself some acetone or you can use the wifes nail varnish remover  ;) easier to get locally than acetone lol and first use some 80 grit paper to rough up the inside then clean away the debri,then clean the whole inside with acetone on a cloth prior to brushing in your mixed resin,then apply your mat ,tear the mat dont cut or any overlaps will be visible and not fully incorporated into the other ,wet out your mat with a brush and more resin untill fully wetted out NOT OVER WET or it will get heavy pretty quick,be careful to follow mixing chart on the tin.Hope this helped.
Mart
waveridermouldings

Thanks Mart, a trip to Halfords or car body repair shop it is then!   :-))
Logged
Built:- Club 500, Caldercraft HMS Orestes (Mars as they call it.)
Building:- Aeronaut Ramborator, Caldercraft Puffer Northlight & Caldercraft HMAV Bounty
On the bench:- Caldercraft HMS Snake, HMS Endeavour.

martno1fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,472
  • Location: Blackpool
Re: Repairing / strengthening Hull
« Reply #12 on: March 08, 2016, 09:53:44 pm »

Have you tried it ?,i used to use it before i got into doing the boats and never had any issues to be honest.
Logged

martno1fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,472
  • Location: Blackpool
Re: Repairing / strengthening Hull
« Reply #13 on: March 08, 2016, 09:58:54 pm »

Thanks Mart, a trip to Halfords or car body repair shop it is then!   :-))
Glad to help and if you ever need larger amounts try these guys theyre very reliable its where i get all my materials from.


http://www.ecfibreglasssupplies.co.uk/
Logged

martno1fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,472
  • Location: Blackpool
Re: Repairing / strengthening Hull
« Reply #14 on: March 08, 2016, 10:33:50 pm »

Nail varnish remover often contains oils which are good for your nails but not for cleaning before glassing.

Jim
Probably right with the newer brands nowadays but the cheaper stuff seems to still be mostly acetone like the old stuff used to be .Might not be ideal but ok if you have nothing else  but yea best use acetone if you can get it .
Logged

Colin Bishop

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 12,171
  • Location: SW Surrey, UK
Re: Repairing / strengthening Hull
« Reply #15 on: March 08, 2016, 11:42:37 pm »

Best place to buy acetone is probably a yacht chandler.

You do need to be careful with it.

Colin
Logged

essex2visuvesi

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 6,148
  • Location: Finland, England, Finland!
Re: Repairing / strengthening Hull
« Reply #16 on: March 09, 2016, 12:43:43 am »

Glad to help and if you ever need larger amounts try these guys theyre very reliable its where i get all my materials from.


http://www.ecfibreglasssupplies.co.uk/


Can confirm, and excellent and most helpful supplier!
I think Stavros recommended them to me
Logged
One By One The Penguins Steal My Sanity
Proud member of the OAM  (Order of the Armchair Modeller)
Junior member of the OGG  (Order of the Grumpy Git)
Pages: [1]   Go Up
 

Page created in 0.107 seconds with 21 queries.