DO NOT add the acid. I tried this with detrimental results. My parts were ruined and I am re-sandblasting, cleaning, plating etc. I spoke with someone on the phone today at Caswell who said that the acid was very wrong to add.
He didn't belive the 1:9 said 1:4 sounded better and then was shocked when I mentioned the acid. I'm not sure that you have a correct set of directions anywhere for this stuff.
Mike on the phone seemed very willing to help correct the situation, but know that adding acid is not the right thing to do.
-Chris
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