[PSUBS-MAILIST] Fiberglass work k-250 mbt

[Michael Dell via Personal_Submersibles]

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
>>> _______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20200901/c8f28b2a/attachment-0001.html>