Well I repaired my pads 1 and 2 with this stuff:
CircuitWorks Rubber Keypad Repair Kit (thanks for the info Spiral!)
If you void your warranty or screw up your MPC1K don't blame me it's your fault not mine. You have been warned.
1. It was a pain in the a$$.
2. When the instructions say it takes 24 hours to dry then it takes 24 hours to dry!
3. It was worth the tension and stress.
I only did the repair because I called VST and it seemed pretty
easy to just buy some new pads ($16 each) if I messed them up so I figured what the heck.
I chickened out on my first attempt because the little black tabs looked fragile but I figured if Antonym could do it so could I!
At first I thought I destroyed my pads but it turned out I didn't let the Keypad repair gloop listed above enough time to dry! After a solid 24 hours my pads really are just like new!
Even if you buy new pads you still have to take some of your MPC1k apart. If you are not the kind of person who likes to take things apart and be happy even if you break or destroy something then don't bother and have a shop fix the pads.
*NOTE: The repair gloop was listed as HAZMAT and only ships ground.