I noticed the bezel colour on the V1 compared to V2 is slightly different, V1 is brighter and more metallic while the V2 is slightly duller and darker. I prefered the V1 colour
From what I can gather the OPs movement uses screws to hold on the dial and the CH8836 doesnt it used the clamps like the ETA and its clones:
http://www.allwatchparts.com/-Chinese-Automatic-8836-Mechanical-Movement_p_921.html
If yours didnt use the screws to hold the dial in place it wasnt the same movement as OPs.
The is a thread on RWI where guys have tried to swap the 25J new breed movement and hands with a clone ETA and they had hand fitting issues.
Just to confirm the movement shown by the OP is NOT a CH8836 and parts are NOT interchangeable with the ETA 2836-2 or true Chinese 2836-2 Clone movements. It is the new breed 25J which I think are pretty unreliable and with no parts available and hands that arent compatible with the ETA 2836-2 (I think the hour hand is too big from what I can recall) they are ready to throw out when they go pop!
Ive always used the putty and i havent had any problems with waterproofing I suppose it depends on how firm the putty is and how much torque it provides. This one seems to work really well
Yea its kind of like rodico putty but firmer and slightly sticky.
I found that the screwballs dont work all that well unless the caseback isn't screwed tightly to begin with. I had a one of the balls and it never worked that well.
Its like a sticky firm putty that you roll into a ball, you press it against the caseback firmly so it moulds to the caseback shape, then grab the putty and twist anticlockwise and the friction between the putty and the caseback grips enough to turn the caseback