I have one glued on my Henderson 5mm. What I did was put the suit on, hold the pocket where I wanted it, have someone (my g/f) trace around it with lipstick (we didn't have any chalk), and then take the suit off and follow these directions:
Necessary Tools: chalk, small brush, small roller
Recommended Adhesive: McNett Seal Cement
1. Don suit and hold pocket in desired location. (Recommended placement is on outer-thigh to keep the pockets out of the flow)
2. Use chalk to outline the desired location for pocket.
3. Remove suit and place on a hard flat surface.
4. Apply first coat of Seal Cement around outer one-inch strip on both the suit and the pocket.
5. Allow the adhesive to get tacky for about ten minutes and then apply a second coat.
6. Allow the adhesive to dry until tacky, for about ten minutes, and then apply a third coat.
7. Again allow the adhesive to dry until tacky, about ten minutes.
8. Place the pocket on the suit in the exact location desired. (Make sure its correct since it will not move easily at this point)
9. Use the roller to roll the pocket on the suit.
10. Allow drying for at least 24 hours before diving.
Mine is still on there really good and I have about 60-70 dives on it since I attached it. I used the black McNett's...it blends in with the suit better and it doesn't look as bad as the clear stuff... Also, I cut a piece of stuff cardboard from a box that was a little larger than the width of the leg of the suit and stuffed it in the leg to hold the material taut while attaching the pocket and while drying.