need help with surface prep

[acidrain]

Use Caswell's de-ox de-smut instead. It will take smut away in seconds.

[destroyer125]

Originally Posted by fourkbmx

lye turns aluminium black and te muriatic acid turn it back in a very light grey color ready for ano, that is what im using, could you please describe your prep process, because im trying to use something that isnt as reactive as these because im working with 7075 and it isnt as resistant as other alloy so i've screwed a couple of tries.

As acidrain said, Use caswells deoxidizer/desmut to remove that black film, heat it to 140 and soak for 30 seconds to a minute then rinse .