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Originally Posted by seanc
This is for the blackener? I have never heard of trying to use it at higher temperatures. I've always just used it at ambient, most recently that has been @65ยบ.
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Yeah, I gathered that from the thread from August 2003 you gave a link to. The original poster said:
I read this morning on the web that the solution is supposed to be 1 part to 4 parts and that a small amount of acid is suposed to be used... and that it should be heated to a minimum of 90 degree and left for ~5-7minutes.
Later he asked about the acid, and Caswell replied
Yes, the instructions on the web are accurate., and I took that to mean the 5-7 minute immersion time, the 4:1 concentration, and the heating to 90F to be correct, but I wasn't sure about the acid.
It could be the original poster got mixed up with the acid part while reading about preparing old pot metal, it is dipped in a weak acid/water mix to get it ready, but it also sounds like the original poster stated he read online about the 5-7minutes, the 90F, the 4:1, and the acid, and Caswell replied that the instructions are correct.
The poster then tried the acid in the blackener, which was a failure, and he posted that it didn't work at all.
The current online instructions match my bottle and manual, 9:1, room temp, and 2-5 minutes.
I'll try a batch at 4:1, 90F, with longer dip times, and then seal them right after rinsing them (from these most recent instructions, I agree with what you said about drying them, then displacing dried water
), and see what happens then. The plate, zinc solution, and blackener will probably ship tomorrow, so in a few days I should know something.
I'm really hoping to get this to work. I really need the bolts to look fresh dipped after I install and torque them, they are going on rebuilt VW trans, and they'll be paying $800-$1000 each for them, so details matter
Broke