Delaminating mess up and looking for glue up tips

[Susquehannariverarcher]

Glued up an all zircote glass long bow. And when I checked it using the push pull method the belly glass came right off. I could peel it off like tape.

I used a lot of 1:1 mixed ea 40, weighed both parts and everything. Put it in the heat box like I normally do, etc.

After talking to someone through here I'm wondering if using acetone on the zircote caused the oils to lift or something. I haven't used acetone on the veneers on my 2 previous bows. But these one got pretty dusty in storage.

Also glue up is my part I'm struggling the most with. I definitely have some short comings in my form and I'm going to build a new one. But I'll take any and all glue up tips.

[B-JS]

Don't use Aceton on "oily" woods.
If you have dirt or dust in your veneers, sand them and blow of the dust.
Mix Smooth on 2:1.

[Tim Finley]

Mix by volume not by weight .  Part B is lighter than part a so you would get too much of part B by weighing 50 -50 . Acetone works to clean oily woods I use it everyday .

[jess stuart]

I never use acetone on veneers.  How old is your epoxy? I mix by volume, be sure and mix it really well.  Several years back we had some bad ea 40 sure we aren't having a repeat

[Susquehannariverarcher]

Epoxy is new. And good to know about doing it by volume. I'm curious on why only one part delaminted.

[kennym]

I never use acetone on anything to glue up. Brush or blow off(clean air) , I use 40 - 50 grit on lams and riser parts, I know veneer sheets I've bought seem pretty smooth, so last one I did with those, I clamped one end and block sanded with 50 , pushing away from clamp always ,if you pull back you break a veneer(I know this!!)

EA 40 is pretty easy , as long as you don't get too much of the hardener in it. I measure with plastic cups and go with a little more part a than b.

You can go as much as 2A:1B but I never go that much.

[kennym]

Oh, Chad Holm was shooting a bow when he was here to hunt once ,he peeled glass off of due to streaks and put new glass on.  Said if you warm the glass  at tip , get a knife under it and warm it a little as you peel, you can take it right off.  I'd see if I could save it by removing glass, sanding the glue on lam and glass with a block to keep even , and run her thru the form again. Might be out a bit of glue if it doesn't work...

[Susquehannariverarcher]

Oh, Chad Holm was shooting a bow when he was here to hunt once ,he peeled glass off of due to streaks and put new glass on.  Said if you warm the glass  at tip , get a knife under it and warm it a little as you peel, you can take it right off.  I'd see if I could save it by removing glass, sanding the glue on lam and glass with a block to keep even , and run her thru the form again. Might be out a bit of glue if it doesn't work...

I might have to.give that a try. And thanks for the information. The rest of the glue (all from the same batch) seemed to hold up but I'll give a try back in the press.

[Crooked Stic]

I clean my glass with acetone. Never on wood. Like Kenny said always use more resin than harder by volume.
I have never got too excited about the mix as long as more resin than hardener. Heat mine up to about 135 4-6 hours depending on temp at the time let them cool and good to go.

[Susquehannariverarcher]

Crooked stic do you do anything different with oily woods? My last bow was curly maple and all went well.

When I inspected the failed bow this afternoon. The glass separated very cleanly and left a very smooth layer of epoxy on the veneer.

[jess stuart]

I too always scrub the glass with acetone but never any woods.

[Mad Max]

Glued up an all zircote glass long bow. And when I checked it using the push pull method the belly glass came right off. I could peel it off like tape.

What is the push pull method??

[Susquehannariverarcher]

Glued up an all zircote glass long bow. And when I checked it using the push pull method the belly glass came right off. I could peel it off like tape.

What is the push pull method??

Yep. It happened immediately, very little pressure.

[Susquehannariverarcher]

Here's a bad picture of what happened. Dropped my phone the other day

[Susquehannariverarcher]

Here's a bad picture of what happened. Dropped my phone the other day

[Crooked Stic]

If your MC is good tĥen wood just needs to be fresh sanded and blowed off with air I can't use the rosewoods they break me out.

[Susquehannariverarcher]

Ok good to know stic. Always learning something...

[Susquehannariverarcher]

Glued up an all zircote glass long bow. And when I checked it using the push pull method the belly glass came right off. I could peel it off like tape.

What is the push pull method??

Just realized I read this wrong. And push pull is like the stringing method. But i didn't have a string on it. I heard someone call it that once. Idk know the actual proper term for it.

[onetone]

It seems to me, that if the glass peeled off “cleanly and left a very smooth layer of epoxy on the veneer” the problem was with the glass and not the wood. Are you 100% certain you wiped down that glass? That would be the question I would be asking myself in the same situation.

[Kirkll]

It seems to me, that if the glass peeled off “cleanly and left a very smooth layer of epoxy on the veneer” the problem was with the glass and not the wood. Are you 100% certain you wiped down that glass? That would be the question I would be asking myself in the same situation.

I think I would agree with this post. I always clean glass only with acetone. Never the wood. Freshly sand, and use a brush just prior to lay up.   I mix my EA 40 about 2/3rds resin to 1 third hardener, heat it before mixing, then mix throughly with my drill and a paddle bit for a minute or so.    Kirk.