Is it worthwhile degassing my coating resin in my vacuum chamber?


Is it worthwhile degassing my coating resin in my vacuum chamber?
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FiftyPence
FiftyPence
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Is it worthwhile degassing my coating resin in my easycomposites vacuum chamber before brushing it onto my part?

Thanks in advance for your advice.
wozza
wozza
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Not really if you are going to apply it by brush then you will introduce air back into the resin simply by brushing. Brush on the resin as carefully as you can then go over the part with a heat gun and you will see any air bubbles rise to the surface and "pop"

Carbon Copies Ltd
Edited 12 Years Ago by wozza
carboncactus
carboncactus
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As mentioned a heat gun works, but you have to be careful. too much heat and youll create a cluster of epoxy vapour bubbles and make it worse. I also keep some acetone in a spray bottle and mist the coated part, it will temporarily thin the epoxy and the bubbles will pop. The acetone evaporates almost instantly.

http://www.talkcomposites.com/Uploads/Images/db628ad5-e0e7-47b9-873a-3d84.png
Edited 12 Years Ago by carboncactus
benet
benet
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acetone in a spray bottle. that sounds so dangerous.
benet
benet
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i have just been building a degassing chamber for this very purpose as i was finding tiny specks of polish getting into minuscule holes in my finished ( hand applied )  coating causing white speckles. I havent tried the degassed resin yet so i cant give a full answer however i can say that i was advised that degassing may be a rout to solving my pinhole problems.

I dont use a vacuum chamber or pump in any other part of my hand layup process.

I would like to know however as i'm new to degassing is it normal for the resin to get worse before it gets better in the degassing process. I find that when i add heavily stirred ( big bubbles) resin to my chamber the big bubbles quickly go but are replaced by tiny ones that take a a further 10 minutes or so to finally rise and pop in my chamber. is this normal or do i have a leak or something causing a problem ?

Thnaks

Ben
carboncactus
carboncactus
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benet (21/06/2013)

I would like to know however as i'm new to degassing is it normal for the resin to get worse before it gets better in the degassing process. I find that when i add heavily stirred ( big bubbles) resin to my chamber the big bubbles quickly go but are replaced by tiny ones that take a a further 10 minutes or so to finally rise and pop in my chamber. is this normal or do i have a leak or something causing a problem ?



How big is your vac chamber? I made a large one (about 10L) and it took way to long to evacuate. Eventually I made one just large enough for a cup of resin:



It evacuates in less than 30 seconds (tested with gauge)

If you get any bubbles after evacuating, what you're seeing is the solvent evaporating.

http://www.talkcomposites.com/Uploads/Images/db628ad5-e0e7-47b9-873a-3d84.png
Matthieu Libeert
Matthieu Libeert
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Carboncactus,

Is that an connection for compressed air?

Matthieu Libeert
Founder MAT2 Composites X Sports
website:
www.mat2composites.com




carboncactus
carboncactus
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It's just a standard male vacuum connection

http://www.talkcomposites.com/Uploads/Images/db628ad5-e0e7-47b9-873a-3d84.png
Edited 12 Years Ago by carboncactus
FiftyPence
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thanks for the feedback guys, in that case I will not bother degassing the resin as I will be applying it with a brush.
Shaneer22
Shaneer22
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Do degass your resin,you are going to introduce some with your brush,but when you mix your resin then degass you can see how much air your removing alot.
GO

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