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Spots on steel parts from tumbling

Q. Hello
I am having a problem while tumbling steel parts using stainless steel pins, there are small dots left on the parts after tumbling.

I am using water with Holdtight 102 ⇦[this on eBay or Amazon affil links] -- approx. 500 ml water to 1 tsp of Holdtight.

If I dip the parts in muriatic acid ⇦ this on eBay or Amazon [affil links] afterwards the marks are reduced greatly.

How to solve this problem when tumbling steel parts using stainless steel pins ?

Josh Gonsalves
- Trinidad
August 19, 2024

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