Has anyone had experience with cyanoacrylate adhesives for gap filling? I want to know if I can use this type of adhesive to glue small sections of various timbers about 4mm thick to a timber substrate. I need quick and very permanent adhesion without subsequent movement, as the pieces are fitted tightly together forming a geometric pattern.
From WOODWEB's Finishing Forum
CA could work well for this application providing you don't need a high degree of water resistance and the pieces won't be subjected to considerable shock.
1. Moisture: If your wood is dry, make sure that humidity is high. Often a heavy breath on the material just before gluing is sufficient. This moisture allows the adhesive to cure properly and will keep it from absorbing water later. It will then be quite waterproof.
2. Acid: Most woods and your skin oils are slightly acidic. CA cures best in an alkaline environment. Dusting the area with baking soda will solve this situation.
3. A tight joint: CA cures when it reaches a certain thinness, in the absence of oxygen. Open cell woods can give you a little trouble if you do not seal the pores first.
With these things in mind, CA can be the best wood glue that you have ever used.
I know that most containers of Jell CA say not to flood the surface. This is because they want to see an "instant" bond. If you flood (cover) the surface then clamp strongly, the CA will act as a hydraulic jack, lowering the pieces together slowly and evenly. Allow 20 minutes to cure before routing or turning. The bond will reach full strength in 24 hours.
A CA adhesive intended for wood is usually formulated to eliminate the acidity problem. Avoid a CA not intended for wood.
There is enough moisture, even in dry wood (about 24 gallons per MBF), that moisture for curing is not an issue. Moisture can be helpful with gluing other materials.
Those companies that serve industry often charge more, not less, because of the selective adjustments that they make to the formulas and they avoid packaging for the public.
Getting large containers is not necessarily cheaper. You have shelf life and contamination problems. I find that small disposable applicator bottles are the way to go. Since a .7 ounce bottle can do up to 40 feet of seam (in 1/2" Corian) it is time to dispose of the bottle by that time.
We sell only one "industrial" version, because it is hard to get a good wicking version and the quality was far superior to others we tested. For applications where wicking is not an advantage, I recommend "Hot Stuff" and other brands that are available everywhere.