Does Armour Etch harm plumbing? (I’m concerned about rinsing it down the drain.)
Armour Etch and other hobby creams do not really harm plumbing, but it can etch your porcelain or ceramic sinks if any residue isn’t washed off quickly. People wash the acid cream down the drain all the time.
I always recommend that people wipe down most of the cream before it’s washed off for many reasons. This limits the amount being washed into the water system, and it can actually be reused- which many people aren’t aware of. That will save you some money also. Hydrofluoric acid, on the other hand can cause a problem and would be illegal to wash into the water system without proper disposal.
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