My new project..another lifeboat or two. - Page 6 - RC Groups
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Nov 23, 2012, 05:50 PM
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Tim B.'s Avatar
I didn't realize there was so much work that goes into all this, What a job !
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Nov 23, 2012, 06:03 PM
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all enjoyable though tim.
Nov 27, 2012, 04:03 AM
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time scale of a mould:

08.30 hours......

the PVA blue release agent has been painted onto the blooms when added because of the wax that has already been added to the plug.........this is just surplus agent and although it shows slightly on the mould, it is easily wet and drie'd out when cleaning up the new mould before taking mouldings from it.
This PVA release agent is NOT the same as PVA glue, and the latter should not be tried at home, lol......I have never done it, and for the sake of getting the right stuff, wouldn't want to for feer of kerknanckering the plug or mould.
Last edited by nhp651; Nov 27, 2012 at 07:50 AM.
Nov 27, 2012, 07:45 AM
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10.00 hours.

The first layer of precoloured gelcoat has been added to the plug, and is now beginning to go "off"
It is important to get the first layers of matting onto the gelcoat within 24 hours of laying the GC or it could delaminate under certain circumstances............cold weather layup for inst.
Preparation is the most important part of any GRP moulding process, as it is the filthiest, stickiest most horrid process that you can perform (except for RTV rubber moulding) and that's why I like it, lol.
To be prepared is the escense of the job as there is nothing worse than finding that you need to cut more matting half way through a layup with a tub of resin going off.
Like wise it is no good finding that once you have split the mould, you find that you have forgotten to put the catylist hardener into the mix.......been there , done that and got the duff mould...see the last 3 pics..........
so get your mix ready, get the matting ( easier to put matting back in the bag once finished rather to try cutting more matting with sticky gloves and scissers) and if you find the matting a little to thick to bend round sharp corners split the smaller cut sheets into two..........the pic shown shows that even 1oz chopped strand will split and easier to form and impregnate around such areas as the belting and the tunnel area of my mould.
the scales are for weighing the gelcoat and resin for adding the catylist at correct proportions and the ratios are on the small note that I have next to the scales....the other sign is self explanatory, lol
Last edited by nhp651; Nov 27, 2012 at 07:51 AM.
Nov 27, 2012, 07:48 AM
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the matting cut to size and preparation for laying up, and split to thinner layers
Nov 27, 2012, 07:50 AM
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11.30 hours:

the first layer of matting has been put onto the mould...this layer was split into thinner sheets to enable it to go over the right angles of the keel, and the bump of the belting easier.It was well stippled with brushes to get rid of any trapped air bubbles which would need filling after and once hardened will be a good base for thre more layers of matting to give a decent thickness for a mould.
Once this has gone off, those layers can be added.
Nov 27, 2012, 09:07 AM
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Tim B.'s Avatar
This looks like Very messy business !

Hope you have ventilation ~

Very interesting to see Neil.
Nov 27, 2012, 01:24 PM
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Originally Posted by Tim B.
Hope you have ventilation ~
god No the's the only high I get these days, lol

15.30 hours.
last layers go on to the first side of the mould...this will be left to cure in a heated garage overnight and then the flange will be split from the first half the mould.
Nov 28, 2012, 02:19 AM
Taking care of the pond.
Looks like fun.
Nov 28, 2012, 03:28 AM
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it is, Millertime..great to see a hull emerge from a mass of glass and resin.messy but just off out to the shed to trim the first side up and remover the flange noe......then a day of waxing the other side, before repeating the process on the other half tomorrow................hopefully???
Nov 28, 2012, 06:01 AM
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Day two, 09.00 hours:

trimmed up the mould and sanded it all over to remove sharp shards and splinters of matting "needles" which hurt a great deal if you get them into your fingers.

Remove the MDF flange and remove any overspill dribbles of resin from the "virgin" half of the plug.

wax up another coat..........
Nov 28, 2012, 01:17 PM
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day two, 16.00 hours..........after a day of waxing the plug, having given it 8 coats of release wax I gave the plug 2 coats of PVA release agent..........hoping that even though I have made the mould in only two halves rather than four will separate with ease.
well!!, that's the dream and hope.
Nov 28, 2012, 01:19 PM
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17.30 hours
the second side of the plug was covered with white's hoping.
Nov 28, 2012, 02:39 PM
r/c ships and workboats
Having done some mof this before, I can appreciate the efforts in setting this up. The second half is always the more intense side as you have in essence made a cacoon around the plug. If every thing goes the nway it should, then once curred pop them appart and htere you have it. But if you didn't do all the steps with care----well no imagination needed there!
Nov 28, 2012, 04:54 PM
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It's always a gamble as to whether the plug and mould will perform together as one, to allow the mould to seperate in the end.......but always a triumph when it does.

18.00 hours:
The start of the final layer of the mould has begun. I split the layers of matting again to go around the belting, the keel and into the tunnel, and with well stippled resin into the matting it has covered well, hopefully without air bubbles.
The final layers will go on tomorrow morning.

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