Ok I know this shouldn't be rocket science, but does anyone have tips on on how to remove a thin aluminum valve cover that's been RTV'd to the engine (rather that using a gasket) ? The instructions say to gently pry it off around the corners, but man this thing is stuck solid and won't even budge. It doesn't help that the valve cover is so flimsy that as soon as you put some real pressure on it it starts to just bend, all the while the glue seams stay put. The whole thing is made more awkward by the fact that it's tough to get a good angle on it with a screwdriver. If nothing else I can just force it off in which case the cover will be toast and I'll slap another on there. Does heat help, or any other tips?