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There is also CS-FLUX which seems to be flux specially designed for BGA rework by a laptop repair workshop. Amtech flux is very good for this job but quite expensive (on ebay most Amtech flux that is offered for under 25$ from China is low quality Chinese copy). If you intent to do just a reflow you will definitelly need apropriate flux to be injected under the GPU. You may encounter the MacBook beeping 3 times alternating between long and short sounds. Thus, the failure of the device to complete an integrity check triggers the beeps.

This component could be damaged or out of place. According to Mac computers: About startup tones : '3 successive tones, a 5 second pause (repeating): This indicates RAM does not pass a data integrity check. A 3-beep sound within a 5-second interval proves a RAM-related issue within your MacBook Air or MacBook Pro. Once I changed the power source to go directly into my MacBook, the beeping would stop. Beeping usually indicates a problem with RAM, though I think it can indicate other hardware problems too. A reflow (heating of the solder balls under the GPU at around 250 degrees) could fix the problem temporary but in order to have a permanent result you need to remove the GPU and replace the solder balls (reballing). I found that when I plugged my MacBook Pro power source into a hub (USB-C) and then the hub into my MacBook, when I shut it down it would beep every 5 seconds or so.