[PSUBS-MAILIST] Fiberglass work k-250 mbt

Wed Sep 2 11:59:19 EDT 2020

Mike, I would like to make a mold for my K-250 MBT.

James, nice work ! I think to make a plug and use it as the mold. My plan
is to make whole front and rear MBT plug and use it to simply put
fiberglass work on it.

Le mer. 2 sept. 2020 à 07:56, James Frankland via Personal_Submersibles <
personal_submersibles at psubs.org> a écrit :

> 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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