Jason, that latter formula should work.

Denaturing gelatin is the process by which the tangled strands of gelatin change shape and can no longer dissolve in any liquid. It is too ionic for organic solvents and too non-polar for water. It forms a gooey whitish mass. I've done it many times by accident.

Sometimes, all you have to do is reheat the mess and when it gets hot enough (30C - 40C) it will redissolve.

You might try that. And watch out for the nitrocellulose. That is nasty stuff.