[QUOTE]Originally posted by JimfromTrafalgar:
[QB] Jim,
Interesting that you plug the bores, but need to lap a bit when finished. I wondered how one could always be certain of a water tight fit, so decided on coating.

I figured you would pick up on that. I don't know if the plugs leak during the etch dip/rinsing/wet carding or not. But constant immersion in the boil tank, neutralization tank, and rinse water (even with immediate drying) in our humid Alabama climate every day for over a week and no oil to protect them will result in some stuff growing in there regardless. We do unplug the bores for the neutralization tank and rinse water just in case the plugs did leak in the etchant tank. I like the idea of protecting the bores with a coating, and appreciate the advice.