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Author Topic: sealing inside of boat  (Read 3767 times)

Glyn Roberts

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sealing inside of boat
« on: April 29, 2016, 04:04:28 PM »

What is the best material (resin or the like) to seal the inside of boat. It needs to  give a smooth finish that is nice to look at besides proofing against water intrusion.  There are many makes that promise but do not deliver so I am asking you guys that have solved this.

Thanks and regards,  Glyn
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Martin [Admin]

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Re: sealing inside of boat
« Reply #1 on: April 29, 2016, 04:27:05 PM »

 
What material is the hull made of?
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Tug-Kenny

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Re: sealing inside of boat
« Reply #2 on: April 29, 2016, 04:29:49 PM »


I always  'Swill'  the inside with runny epoxy resin.  It comes out clear but you can always colour it when mixing.

I pour it along one of the top edges in a line and the tilt the boat upright to allow it to drain to the keel.  If it's too much, then I tilt the boat the other way and have it run up the opposite side.  I then know how much is left to pour.

I keep an eye on it whilst it's going off in case it all runs down hill to the keel, in which case I reverse the boat.

Hope this helps

ken

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Glyn Roberts

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Re: sealing inside of boat
« Reply #3 on: April 29, 2016, 04:52:56 PM »

The boat is DM's  Huntsman enlarged 200% and is all wood.

You have lots of patience Tug-kenny, I tried that and gave up after 1/2 an hour of juggling.  Thanks for that.

Thanks and regards Glyn
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inertia

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Re: sealing inside of boat
« Reply #4 on: April 29, 2016, 06:52:52 PM »

At 1:1 scale I would use Z-Poxy Finishing Resin, diluted with about 20% Isopropyl Alcohol (not meths). Brush it on, let it soak in and set. Another coat won't hurt. Job jobbed. Don't forget that you won't see the inside of the boat with the top on.

At 2:1 scale I'd probably do the same....

DM
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Glyn Roberts

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Re: sealing inside of boat
« Reply #5 on: April 29, 2016, 09:16:37 PM »

Thanks Inertia,  that's what I was looking for, a brand name that one has found OK.

The build is going very well, better than the Precedent kit did.  Thanks for your hard work on the Huntsman.

Kind Regards Glyn
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john44

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Re: sealing inside of boat
« Reply #6 on: April 30, 2016, 09:31:25 AM »

Just out of curiosity Mr M, why not methylated spirit?


John



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CGAux26

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Re: sealing inside of boat
« Reply #7 on: April 30, 2016, 04:50:37 PM »

West Systems epoxy, full strength works for me.  I dab it into all the corners with a foam brush, then roll the boat around some, too.  If a little extra ends up down at the keel, it just makes the boat stronger.
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Peter Fitness

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Re: sealing inside of boat
« Reply #8 on: May 01, 2016, 05:58:23 AM »

I normally use a fibreglass epoxy painted on with an old brush, with extra around the keel just to be sure it's watertight. Depending on the hull material I often use fibreglass matting between the frames as well, for added strength and impact resistance.


Peter.
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Unsinkable 2

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Re: sealing inside of boat
« Reply #9 on: May 01, 2016, 07:13:15 AM »

I do almost exactly like Peter except I only use the matting on the outside. It goes off in about ten minutes but stays a little sticky for a couple of days. After that it's solid and 100% watertight.


An advantage with this is that the resin has a light pink colour and easily shows up any places you have missed O0 ....... U2
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inertia

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Re: sealing inside of boat
« Reply #10 on: May 01, 2016, 08:18:17 AM »

Just out of curiosity Mr M, why not methylated spirit?
John
Because meths contains a small amount of water which will interfere with the setting of the resin. I use 99.9% pure IPA which is readily available on 't Interweb. That's not India Pale Ale, BTW... Meths is OK for cleaning up (but it's pretty horrible with tonic).
DM
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Glyn Roberts

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Re: sealing inside of boat
« Reply #11 on: May 01, 2016, 04:09:43 PM »

Thanks for the response to my Query,  in fairness I will show you the Build that got me searching and it shows a nice tidy smooth resin finish.

Regards Glyn

http://www.rcottawa.com/forum/index.php?topic=15797.0
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inertia

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Re: sealing inside of boat
« Reply #12 on: May 01, 2016, 04:24:18 PM »

Thanks for the response to my Query,  in fairness I will show you the Build that got me searching and it shows a nice tidy smooth resin finish.
Regards Glyn
http://www.rcottawa.com/forum/index.php?topic=15797.0
If you look at the guy's inventory you'll find he'd used two packs of Z-Poxy Finishing Resin by the time he got halfway through. At sixteen quid a throw he's a very generous bloke, especially to sellers of Z-Poxy... 
I thin it down and let it soak into the ply. It might not look as pretty but a) who cares? It's inside; b) it's just as waterproof as a thick glossy finish, and c) it's a damned sight cheaper!
Suit yourself.
DM
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Glyn Roberts

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Re: sealing inside of boat
« Reply #13 on: May 01, 2016, 04:49:14 PM »

Dave you're right I am not made of money, and got carried away by that inner devil that strives for perfection but never achieves it.   I will thin it 20% and buy the Mrs an Anniversary present.  Thanks for your common sense.

Regards Glyn 

 
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ballastanksian

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Re: sealing inside of boat
« Reply #14 on: May 01, 2016, 07:18:39 PM »

That is a very wise decision Glyn. I know of chaps who forgot their anniversary and were denied show passes for quite a while, and the DIY list grows exponentially :((
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canabus

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Re: sealing inside of boat
« Reply #15 on: May 02, 2016, 10:48:43 AM »

Hi All
I use fibreglass resin inside and outside my wooden boats, but, with areas which are going to be a problem getting to like under the deck for example.
I mark out all the glue down areas on the deck before I install the bottom hull panels.
These I mask up and apply resin to the rest, remove the masking tape.
When you get around to install the deck you have a glue line area to work with and end up with a good water sealed model.
I have started restoring an old gas racer which had resin coated inside the engine and radio bay but not forward of the engine bay.
With damage to the bow at some point water as leaked in a rotted some of the stringers but the frames are OK.
The outside had been glassed, so it's in good shape with a few dents.
The side deck areas are not sealed underneath so I will remove these and seal as stated above!!
Plan on installing a brushless motor with a surface prop setup.
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