I have always read that you want to avoid glue on kevlar. I have also read that a small spot of glue on a knot is ok, as long as it is applied where the free tail leaves the knot. Do not saturate the knot.
As dhbarr said above, you will not be able to non-destructively remove the shock cord if you lock it in with a drop of glue...... I tie/sew a small loop in the end of the cord, then run the free end through the anchor point and through to loop. Difficult to explain, but the loop ends up wrapped around the anchor. When/if you want to remove it, just pull the free end back through the loop.
If you are using a kevlar 'string', place something on the string at the end of the tube to spread the force on the tube to a wider surface. This helps prevent the string from ripping through the tube (zipper). Some people use a flag of masking tape, I often use a small rubber sink stopper (make a hole just big enough for the cord to go through, the fix it in place on the cord). A plastic cap from a water/soda bottle might work, but I haven't tried it. YMMV