I think due to the tighter bond there could be a coating on the inside, that works much better , than the cheap stuff you get here and there. Yes, it's more expensive, but it really works. I removed the through holes. I used to use a cheap wick to remove most of the solder by squeezing the head and then pulling out the pins one at a time. THEN we suck the remaining solder out of the through holes. They had to be absolutely clean in order for me to add new headings. This NTE material sucked outโฆ