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Epoxy Help

Johnturner

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I tried to cast a block in a 4" PVC pipe I kept it warm and this is what I got: I know the holes are air pockets, I did not use a pressure pot. It seems it is very brittle and does not want to cut either with carbide of HSS. What am I doing wrong.

PS the wood pieces from thus site.
John

20210508_133211[1].jpg 20210508_133225[1].jpg
 

DKMD

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I don’t know much about casting, but I’d worry about heat build up in a thick epoxy pour like that... I wonder if that is part of why the voids occurred?
 

2feathers Creative Making

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Which epoxy are you using? Very few are rated for 4 inch. I suspect doc is right. I have blown out holes and such like with heat. If it has cracks in it as well, it is almost certainly too thick too fast.
 

eaglea1

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I agree with Doc, what epoxy are you using. A deep pour type may give you better results. You could also do
a multiple layer pour that might work out better if not using a deep pour. Did you use a release agent on the pvc
and did you leave any epoxy inside the pvc, on the release? I would try a multiple layer pour and use a butane torch
on each layer to remove bubbles. Good luck
 

Johnturner

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I will find out which epoxy it was - I thought of multiple pours but thought it would leave hard lines, especially with different colors.
 

2feathers Creative Making

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You will need a deep pour epoxy that is rated for 4 inch depth and possibly put it in front of a fan to pull heat off it the first 24 hrs. You should be using a 72 hour product for something this depth...
 
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