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Author Topic: Old epoxy going soft  (Read 743 times)

briso

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Old epoxy going soft
« on: April 26, 2018, 01:28:55 PM »

Hello all, 1st post, so go easy.

I've just rediscovered boat modelling and intended to restart on a styrene hull I last touched 15 years ago.

I had fitted bow and stern thrusters at that time with epoxy (no idea what make) and now find it is 'rubber', I tore a load of it off by hand.

The BT is fitted and covered by deck now, so inaccessible other than to run glue through the frame cut out to encase it as is.

The ST is partly covered in still hard Milliput, as the 2 propshafts exit the hull  very close above it, so no chance of getting it out without tearing the styrene hull.

 I'm thinking tear off as much soft epoxy as possible, run thin cyano into both sides of the tunnels, inside the hull, to seal it watertight, then quality epoxy over the lot to encase them inside?

I think any effort to extract the tunnels and do it again will rip the styrene hull = scrap...

Any thoughts?

ta very
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Shipmate60

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Re: Old epoxy going soft
« Reply #1 on: April 26, 2018, 08:34:29 PM »

You will need to remove as much of the soft epoxy as you can.
I would mix up more new epoxy than you need on a long thin piece of cardboard.
Use this to pour the epoxy inside the hull and raise the hull so the epoxy runs right round the inside joint, ensuring good coverage of the parts you can't get too.
Then repeat for the other side when first batch has hardened.


Bob
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briso

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Re: Old epoxy going soft
« Reply #2 on: April 27, 2018, 05:28:17 PM »

Thanks Bob, appreciate the confirmation, and gosh, I’m sure thin cyano was not so thin 15 years ago, it gets everywhere!
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jarvo

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Re: Old epoxy going soft
« Reply #3 on: April 27, 2018, 09:11:42 PM »

Hi Briso, welcome to Mayhem, dont worry about questions, lots of people on here have the answers!  Cyno in the old days was thicker, but there are usually 3 versions these days, Thick, Medium and Thin, there are also versions that are flexible (for rubber etc)


Mark
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Shipmate60

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Re: Old epoxy going soft
« Reply #4 on: April 27, 2018, 09:12:48 PM »

However you seal the inside you MUST seal the outside.
If you don't the action of the water will delaminate the grp.
Had this on several full size launches and ended up cutting a great hole out the side and replacing.


Bob
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