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Can I Glue a Finished Surface8/20
I'm making a window seat/chest for a client and I'd like to install the chest and glue on the face frame afterwards. I'm planning on finishing the face frame before gluing it on if that is possible. Is there a glue that I can use on pre-finished surfaces??
I would not rely on glue alone for this, pre finished or not.
First choice would be pocket screws. Glue only if you want. Either rough up the wood on the face frame, so it will absorb a drop of water, or find something that adheres well to the particular finish your using. There is no concrete answer to this.
Biscuits are another way of doing this. I would end up using pocket screws in addition to the biscuits to eliminate clamping. Either mask over the slots or cut them after finishing.This is getting into overkill territory for most applications.
Epoxy, Gorilla glue, and liquid nail are three adhesives that work well on applications such as these. Just go light on the gorilla glue. It foams up and can make a huge mess if you use too much.
Have you tried ROO-GLUE.
Thanks guys for the responses. I'll keep them in mind for the future. I already installed the thing and I just used pocket screws. It seemed more than sufficient.
Here is what will happen...you will glue the one piece onto the other, but the piece with the finish will not have glue attached to the wood but will have glue attached to the finish. So, when considering the links of a glue joint to be analogous to the links of a chain, the weak link will be how well the finish is attached to the wood. If that attachment is weak, then the overall joint will be weak. (Another analogy is gluing to peaches together. The best adhesive might glue the two skins together, but if the skins are not well fastened to the pulp interior, the joint will not have high strength.)
What you want is an adhesive that can penetrate the finish so it can attach to the wood. However, most of the chemical attachments points are occupied by the finish, so even the best adhesive will not be able to attach well tot he wood, as there are limited attachment points.
Bottom line is to use screws or remove the finish down to bare wood.