Maker Paste is a high quality, low cost prototyping solder paste. It comes premixed, so all you need to do is cut off the tip, squeeze the paste onto your solder pads and heat it up using a solder gun, heat gun, hot plate or any other suitable heat source. It's simple, convenient and best of all, it's made in the USA.
The lead free metal content is a mix of tin and copper. The mix is a eutectic solder, meaning that it's either going to be a sold or liquid during re-flow; not something in between.
The custom formula was made by Amtech Inc. specifically to meet the needs of Maker Paste.