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• touch the tip of the solder where the iron meets the pad or the pin

• try to get as much contact with both the pad as the pin as you can

• the pad could be dirty or not hot enough. Especially when the pad is connected to a ground or power plane layer in the PCB it may take longer than expected to reach a sufficient temperature. Usually adding some flux helps remove any dirt.

It’s cheddar cheese with some common, food safe chemicals that help suspend extra water in the cheese to make it melt easier and stringy-er. So it’s basically cheese.