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Epoxy

General discussion on any topic which doesn't have a natural home on any of the other boards.
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RobbieB
Posts: 538
Joined: 07 Mar 2015, 22:22
Location: North West

Epoxy

Post by RobbieB »

Is anyone aware of any problems regarding the compatibility of laminating epoxy and blue foam.

I'm ready to glass the canopy plug for the M100 and I would rather do it in epoxy than polyester. Also, I wouldn't have to tape the plug first.

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Peter Balcombe
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Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Epoxy

Post by Peter Balcombe »

Robbie,
I glassed my blue foam ASK21 fuselage plug using epoxy resin with no problems.

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RobbieB
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Location: North West

Re: Epoxy

Post by RobbieB »

Many thanks chaps.

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B Sharp
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Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Epoxy

Post by B Sharp »

Robbie, I used epoxy rather than polyester for the canopy mould for my BG135. I also used cloth rather than mat thinking I was being smart. BAD MOVE!
When heated during the pulling process the epoxy shrunk and left me with a pronounced weave pattern on the finished canopy. Barry at Sarik put me right!
Brian. :)

Keith
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Joined: 07 Jan 2019, 18:18
Location: Lincolnshire

Re: Epoxy

Post by Keith »

You learn something new every day, good gen, Cliff.

Keith

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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: Epoxy

Post by chris williams »

I now make canopys from MDF

That must be a son-of-a-female-dog to carve and sand to shape?

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Barry_Cole
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Location: Hampshire UK

Re: Epoxy

Post by Barry_Cole »

And the dust will kill you.

:( :( :( :(

BC

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RobbieB
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Joined: 07 Mar 2015, 22:22
Location: North West

Re: Epoxy

Post by RobbieB »

B Sharp wrote:
02 Jul 2019, 18:59
Robbie, I used epoxy rather than polyester for the canopy mould for my BG135. I also used cloth rather than mat thinking I was being smart. BAD MOVE!
When heated during the pulling process the epoxy shrunk and left me with a pronounced weave pattern on the finished canopy. Barry at Sarik put me right!
Brian. :)
Brian, are you saying both the epoxy AND the cloth is a bad idea as I was intending to use cloth?

Once glassed (two layers) I do intend finishing with P38 or similar.

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B Sharp
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Location: Perthshire

Re: Epoxy

Post by B Sharp »

Robbie, I used 3 layers of heavy weave cloth applied with laminating resin. The cloth was then rubbed back to as smooth as possible. A further coat of resin was applied and rubbed back. I suspect that if I had used mat I would have got the same result but with an imprint of the mat.
I have returned to using a blue foam core on 1/4 ply base, covered in parcel tape then fiberglass mat and polyester resin. After sanding with 60 grit it gets a coat of P38, sanded and polished to a finish.
Brian. :)

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RobbieB
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Joined: 07 Mar 2015, 22:22
Location: North West

Re: Epoxy

Post by RobbieB »

B Sharp wrote:
03 Jul 2019, 08:22
Robbie, I used 3 layers of heavy weave cloth applied with laminating resin. The cloth was then rubbed back to as smooth as possible. A further coat of resin was applied and rubbed back. I suspect that if I had used mat I would have got the same result but with an imprint of the mat.
I have returned to using a blue foam core on 1/4 ply base, covered in parcel tape then fiberglass mat and polyester resin. After sanding with 60 grit it gets a coat of P38, sanded and polished to a finish.
Brian. :)
Exactly as I've done in the past Brian (only two layers of matting used) and it has produced almost perfect results albeit on easy canopies to pull:

canopy_plug1.JPG

canopy.JPG
I was just trying to avoid using polyester and mat - not nice to handle but the heating/softening of epoxy does make sense - classic method to extract a metal component from an epoxy enclosure.

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