When I use the  Activator the CA bubbles or foams.

• You are using too much.  The cyanoacrylate has accelerated so much that the heat generated causes bubbles or foaming.
• Use just a light spray.
• For bonding:  Spray accelerator on one surface and Cyanoacrylate on the other. Then press the two surfaces together for an instant bond.
• Using too much Accelerator will weaken the bonding strength.
• Aerosol Activator misting action is better suited to spray directly on Cyanoacrylate which will minimize foaming