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creating a barrier for liquid epoxy

Joined
Dec 29, 2022
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I was at a place today where the guy mills large slabs for sale and sometimes makes tables himself

There was a slab that had a probably 3/4 inch wide crack in it that he had filled in with epoxy.

On the end of the slab I could see what he had used underneath to hold the epoxy in but didn't recognize what it was until he explained.

He takes regular tite bond and coats on either side of the crack then uses strips of bed sheets like tape then coats that with glue and lets the whole thing dry before he flips the slab back over and fills with epoxy, Says he's never had any epoxy leak out since he's started doing it that way. I didn't see why that wouldn't work for a bowl blank as well. I forgot to ask if he just leaves it underneath or if it comes loose with a chisel or something.

Have I been living under a rock and this is a common practice but I just don't know of it? I usually use packing tape and then chase the leaks that invariably form.
 
Joined
Dec 18, 2020
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Location
Encinitas, CA
Use 'resin tape' in the search bar on Amazon/Ebay - sticks to things you want but not to epoxy - never had resin penetrate the tape surface nor stick to the cured resin where it cant be peeled off, but the weak point is the edge of the tape where hydro-static pressure of a column of liquid resin can lift the adhesive tape and start leaking. To prevent such a leak all you have to do is run a nice bead of hot melt glue over the tape boundary so that it spans from tape to wood and that works 95%+ of the time.... for small repairs that is usually good enough as things never leak twice, but if you are doing a big pour and want to have it 100% leak free then start with a thin coat of resin on the tape-wood boundary and let that cure before you mix a lot of resin.

I do this all the time on both flat work -

1734177306241.png

and bowls...

1734177325415.png
 
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