[PSUBS-MAILIST] fiberglass shell

[Alan via Personal_Submersibles]

Brian,
sorry, I read too fast & missed the bit about the hole in the ground.
You've been watching too many of Hank's videos lol.
Is it a symmetrical shape that can be turned in any way?
If you are filling it with syntactic foam you could shape that & fibreglass over
the top. 
Karl Stanley has used car bodies as molds, perhaps you could find something
pre made you could mold over. I have used big blocks of polystyrene like
David is doing. I also used a large exercise ball to make a sphere. I think the way 
you are proposing will be difficult. You would need a lot of plaster as you would 
need it thick to be able to sand or work it without breaking it. Might not be as cheap
as you think. It would be really difficult to get a good finish. One of those jobs
where you get half way through and say "Why the hell did I start this".
Cheers Alan




> On 12/08/2020, at 4:31 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,   I could coat the plaster of paris with resin and then polish that really well , then apply mold release to that , then shoot gel coat over the mold release , then fiberglass and resin over the gel coat.  I would bury some sort of lever underneath the cone so I could pry it out of the ground.
> 
> Brian
> 
>  
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] fiberglass shell
> Date: Wed, 12 Aug 2020 16:24:28 +1200
> 
> Hi Brian,
> I am hearing alarm bells. The plaster of Paris will have to be pretty dry & any
> resin from your fibreglassing would suck in to it unless you gave it several coats
> of shellac first then put on a mould release wax. This is from memory from a long
> time ago. Also I have vague memories of coating polystyrene with pva glue which
> doesn't dissolve the polystyrene, & fibreglassing on to that. 
> Will take a big block of polystyrene.
> Alan
> 
> On 12/08/2020, at 3:14 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi All,
>                I"m thinking of doing a fiberglass nose cone for the front of my sub which will have flotation foam in the top part of it.  This time rather than make a whole mold assembly I was thinking I would dig a large hole in the shape of the nose cone, use plaster to get it smooth and then just put fiberglass against the inside of the plaster.  Then lift the thing out and break off the plaster.  
> 
> Brian
> 
> 
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