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« on: November 08, 2013, 10:48:45 AM »
AnjanBabu
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I built an air boat and the sponsons are hot wired from thermocol to keep the weight low. Unfortunately, the edges of the sponsons are sort of delicate and they break and crumble easily. Is there anything I can coat the sponsons with, that will make it a little tough? It's got to be waterproof and shouldn't add much weight.
I was thinking of Araldite, but inquiring for better options, if there are any.
DSC_1648.jpg
Can Thermocol be hardened?
* DSC_1648.jpg (52 KB, 800x600 - viewed 3569 times.)
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« Reply #1 on: November 08, 2013, 11:05:19 AM »
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Don't wake a Tiger until you've factored the teeth
Dilute Fevicol with water to 50%. Apply a thin coat. Next, lay tissue paper on the wet coat, and apply 2 more coats. Let dry. You will have a tough, hard skin which is easily sandable Cheesy

Note: do NOT use synthetic tissue
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« Reply #2 on: November 08, 2013, 11:12:18 AM »
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Sanjay bhai, Is that waterproof?  Huh?
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« Reply #3 on: November 08, 2013, 11:14:05 AM »
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Snazzy shape - you came up with this yourself ?

looks like something Annakin Skywalker would be driving
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« Reply #4 on: November 08, 2013, 11:17:29 AM »
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Sanjay's method is good - to waterproof paint touchwood over the fevicol tissue matrix
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« Reply #5 on: November 08, 2013, 11:21:28 AM »
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Saikat, yes, scratch build.

Thanks, I will try the tissue and touchwood ideas. Thumbs Up
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« Reply #6 on: November 08, 2013, 11:24:19 AM »
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Don't wake a Tiger until you've factored the teeth
Yes, waterproof when dry. Then as Saikat says, touchwood, or even paint

Saikat,  Thumbs Up Thumbs Up very Skywalker !!! Pod Racer  ROFL
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« Reply #7 on: November 08, 2013, 11:37:16 AM »
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use coro for those winglets
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« Reply #8 on: November 08, 2013, 01:14:44 PM »
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foamybuilder, Those are the motor mount post. It's an air boat. Cheesy
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« Reply #9 on: November 08, 2013, 01:41:59 PM »
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Information sharing improves knowledge of both.
I prefer to cover with coloured polythene 2" Tape for smooth surface. However, this is used in free flight foam glider.
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« Reply #10 on: November 08, 2013, 02:00:41 PM »
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Quote from: AnjanBabu on November 08, 2013, 01:14:44 PM
foamybuilder, Those are the motor mount post. It's an air boat. Cheesy

Plane or boat, strengthening method would remain same. What i mean is laminate it with 2mm coro.
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« Reply #11 on: November 08, 2013, 02:11:01 PM »
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KALYANPRODHAN, that works to keep the thermocol from breaking off, but it still lets the edges deform. Looking to make it hard and stiff at the edges.

foamybuilder, I used 3mm sun board for the mounting post, no strength issue there. Only the sponsons are a little delicate.
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« Reply #12 on: November 08, 2013, 02:22:34 PM »
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will rubber paint work or will it destroy thermocol?  Head Scratching
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« Reply #13 on: November 08, 2013, 02:52:38 PM »
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Don't wake a Tiger until you've factored the teeth
Use enamel or acrylic
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« Reply #14 on: November 08, 2013, 02:53:25 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Wth is rubber paint anyway?
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« Reply #15 on: November 08, 2013, 03:56:21 PM »
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anjan i suggest you to use thin canvas cloth dipped with fevicol glue to cover the foam.  Smiley 
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« Reply #16 on: November 08, 2013, 04:08:30 PM »
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rubber paint is used for waterproofing surfaces. it is often used as a coating on iron sheets to prevent them from rusting.
here is a spray version demo on youtube:
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« Reply #17 on: November 08, 2013, 05:36:35 PM »
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Don't wake a Tiger until you've factored the teeth
OK. The rubberized undercoat. Why would you want to paint a model boat with that? Lousy stuff for finish
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« Reply #18 on: November 08, 2013, 06:04:05 PM »
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that is upto AnjanBabu to decide...  Tongue
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« Reply #19 on: November 08, 2013, 06:46:42 PM »
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Nithinraj, I already covered it with tissue and Fevicol, got to wait and see how good a job I've done.
Not a bad idea, using a fabric.

Aman, I'm looking for some easy and cheap techniques. Cheesy
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« Reply #20 on: November 08, 2013, 11:06:09 PM »
Nithinraj Kotian
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anjan check this out
IMAG0133.jpg
Re: Can Thermocol be hardened?
* IMAG0133.jpg (55.54 KB, 800x602 - viewed 1092 times.)
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« Reply #21 on: November 09, 2013, 01:33:06 AM »
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That's not bad, looks neat.
Going to find out in the morning if i'll have to hotwire new sponsons, the tissue+fevocol coating looked very messy and uneven, it was my first time. Sad
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« Reply #22 on: November 09, 2013, 08:07:25 AM »
Nithinraj Kotian
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local tailor shop will have those canvas cloths ask for 2" width and 1 meter length.
« Last Edit: November 09, 2013, 10:39:15 AM by Nithinraj Kotian » Logged
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« Reply #23 on: November 09, 2013, 12:25:42 PM »
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Tried sanding the tissue coating and it didn't turn out as smooth as I expected.  Sad
Hot wired two new pairs of sponsons, going to try using newspaper instead of tissue on one pair and Nithinraj's suggestion of using Canvas cloth on the other.
DSC_1105.jpg
Re: Can Thermocol be hardened?
* DSC_1105.jpg (56.45 KB, 800x600 - viewed 1419 times.)
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