Repair of epoxy on timber joint - epoxy to epoxy?

Building a harp and using epoxy for the first time (west systems) on certain joints. I did not use any thickening agent as the joint is quite flush.



In gluing the body together I had a joint failure on one of four joints. If you can imagine four sides of a tall slim box (no front or back yet) I have failure on one top corner. I can't force it apart very far without risk of damage to another corner, but can just get sandpaper in. The other joints appear to be very strong and there is evidence of the glue takeup into the timber in the failed joint. Since the joint was quite flush, I suspect overclamping was the issue.



Regluing - epoxy to epoxy?

I can't get down to totally clean wood without totally dismantling it. I'm really not keen to dismantle everything unless absolutely necessary.

My plan is to sand the surfaces (which will still contain remnants of epoxy) to give better surface area. I will also add small blocks inside the corner to increase surface area, which I did at the base anyway.



My fear is that the epoxy won't bond to the epoxy. I've seen differing views on this.