Just curious of what you mean by frustrating with un-even heat. What problems can be encountered if the heat isn't even?
The Mark Lee solution is intended to be applied to the barrels when they've been heated to a certain temp. If you've got an oven to uniformly heat the barrels, and can control the temp, the solution applies more consistently. I do not have an oven, so I have to resort to using a heat gun, which is difficult to get the a consistent heat along the entire length of the barrel. Not a deal breaker, but not as ideal as an oven of some sort.
