[PSUBS-MAILIST] Fiberglass work k-250 mbt

Wed Sep 2 07:54:55 EDT 2020

Hi Phillippe.

I made a glass fibre plug and mould last summer for a completely different,
not submarine related project, but the principle is the same.  This was the
first time i had done this but it turned out ok.

1.  Make a plug out of anything more or less.  I used wood and covered it
with plaster of paris.  I made this spinning shape thing to scoop the
plaster into the correct shape.  Key is to sand the plaster utterly
smooth.  Even the tiniest scratch will show on the mould and eventually
your part.
2.  Cover with wax, gelcoat and then glass fibre.
3.  Pop out the plug (difficult as the glass shrinks onto the plug).
4.  Polish and wax the mould.
5.  Cover the mould with gelcoat, then glass fibre.
6.  Pop it out.  (easier as the part tends to shrink away from the mould.

There are lots of people with more expertise, but I didnt find it too
hard.   I would just crack on and give it a go.  Maybe read up on some
fibreglassing web sites.  Once you have a decent mould, you can bang out
plenty of the parts.

Have a look at these pics.

1.  Initial wood and spinner.
2.  Covered in plaster.
3.  Making mould.
4.  Mould done and polished.
5.  Filling mould to make part.
6.  Finished part just out of mould.  Needs polishing.

[image: Untitled.png]
might help?
Regards
James

On Tue, 1 Sep 2020 at 22:10, Michael Dell via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> What shape are you looking to make?
>
> Mike
>
> On Wed, 2 Sep. 2020, 3:54 am Philippe Robert via Personal_Submersibles, <
> personal_submersibles at psubs.org> wrote:
>
>> Hi Mike,
>>
>> I don't figure how to make the mold from timber ? Maybe many cut
>> of plywood ?
>>
>> Philippe
>>
>> Le mar. 1 sept. 2020 à 01:07, Michael Dell via Personal_Submersibles <
>> personal_submersibles at psubs.org> a écrit :
>>
>>> Styrofoam is the problem, the timber is quite easy to surface and
>>> achieve a reasonable finish to mold from, i often make temporary molds from
>>> custom wood and brush on between 5 and 8 layers of polyester resin which in
>>> warm weather is usually achieved in a day, once cured i sand, polish and
>>> wax up... styro foam however is not going to like polyester at all... you
>>> could use the same method as i have discribed but coat the foam, and the
>>> ply for that matter with an epoxy resin then transition to a polyester by
>>> first coating the initial few coats of epoxy with a couple of coats of
>>> vinyl easter resin, this allows you to carry on with cheaper poly easter
>>> which is easier to sand etc. Or you could do the whole coating process with
>>> epoxy, i just find polyester easier to work and a lot cheaper.
>>>
>>> The other option is coating the foam with tape to get a rough part off
>>> then clean that up to get a mold proper...
>>>
>>> Mike.
>>>
>>> On Tue, 1 Sep. 2020, 12:04 am Philippe Robert via Personal_Submersibles,
>>> <personal_submersibles at psubs.org> wrote:
>>>
>>>> Hi David,
>>>>
>>>>
>>>>
>>>> I'm looking to make a mold with plywood and foam. I have a good idea
>>>> how to make It, but no idea how to have a good finish on it.
>>>>
>>>> I'm wondering what product to use to cover the Styrofoam and wood of
>>>> the mold, I don't want the fiberglass sticking to my mold.
>>>>
>>>>
>>>> Regards
>>>>
>>>>
>>>>
>>>> Philippe
>>>>
>>>> Le dim. 30 août 2020 à 15:31, David Colombo via Personal_Submersibles <
>>>> personal_submersibles at psubs.org> a écrit :
>>>>
>>>>> Hi Philippe, Are you looking to make the mold as a plug or a one off
>>>>> part. Let me know and I can give you some tips.
>>>>>
>>>>> Best Regards,
>>>>> David Colombo
>>>>>
>>>>> 804 College Ave
>>>>> Santa Rosa, CA. 95404
>>>>> (707) 536-1424
>>>>> www.SeaQuestor.com
>>>>>
>>>>>
>>>>>
>>>>> On Sun, Aug 30, 2020 at 9:42 AM Philippe Robert via
>>>>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> I would like to know if someone has experience in fiberglass making.
>>>>>> I am looking for a starting point for making a kind of mold to construct
>>>>>> the mbt.  Have never work with fiberglass before.
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>> Philippe
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>>>>>>
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