LBT lubes are not effected my melting and resolidifying, no matter how many times. Nor does it break down or loose effectiveness with age. I've only been able to test it for 30 years, using stored samples, as that's how long ago I started making it.
The melt around the bullet method is actually called the cookie cutter method by quite a few who do it.
If you do it with LBT lube watch the solidifying lube closely and cut them out just after it becomes solid, while still nice and warm, or you will hardly be able to pull the cutter out of the block. -- I dispise the method personally, finding it more messy than just keeping a dab on the index finger of my master hand. I inspect the bullet for visual flaws, wipe the lube on, tip the lube finger up out of the way and run the loading press with that hand, to immediately seat the bullet. I've loaded probably 10,000 rounds this way, before I bought a lubricator. If using gas checks, the bullets must be sized to crimp them on, which is the operation which follows the lube application. If you want to try finger lubing, get my Blue Soft. It will work well with the cookie cutter too, but Commercial is best for that method, if thats the way you like to do it. When you make the cutter cartridge be sure to get a good snug fit to the bullets so it wipes them fairly clean.