I should note that to withdraw the glue components from the combo glue tubes, use a long, blunt 14 gauge luer lock dispensing needle, such as this:
Using these, you won’t need to buy the expensive dual plunger applicator gun that you would otherwise need to dispense the glue (unless you want to use the glue for other things).
The longer the needle, the more suction you need to apply to get the rather viscous glue components to flow into your syringe. You also might want a larger syringe (like a 10 cc syringe, rather than a 3 cc syringe). The larger the syringe, the more suction power it can generate. The glue will not set up inside the respective syringes (unless it was somehow mistakenly mixed with the other glue component).