Not sure what Valor used, but to strip mine I used a spray called Tal-Strip by Mar-Hyde. Within about 5 minutes, the paint was bubbled up and I simply wiped it off.
As for cutting the edge off, I used a fine-tooth metal blade in my jigsaw. I scribed a line around the sled with my metal caliper. Make sure to wear ear protection when cutting.
Here's a pic of mine after having Mr. Stan Lee sign it in STL last weekend.
https://sphotos-a.xx.fbcdn.net/hphotos-frc1/901371_10151522537027446_618116748_o.jpg