We are doing Rocky Horror and Frank is going to hack up Eddie with a hand saw and other old power tools in a large chest freezer. He will have two tools, one clean and one covered in blood which will be switched while he's hacking away in the freezer. Due to multiple reasons, we don't want to deal with fresh wet stage blood. SO, I need to coat the tools with something that when dry will stick to metal and look like fresh blood. Suggestions?