Update on my darkroom sink: Topic was part of a thread I started earlier this year. Sink and base were constructed from 3/4" exterior plywood. Inside of sink was painted with 6 coats of Rust-oleum Restore 4X Deck Coat paint over Rust-oleum's proprietary primer. Paint is so thick that no need to caulk corners. After months and months of constant use I can 100% recommend this paint. Sink still looks like it did after I applied the last coat of Rust-oleum Restore 4X Deck Coat paint. The buildup of the 6 coats of the paint produced a very mildly flexible surface... several times my glass graduated cylinders have accidentally tipped over but never have they broke. I like to create Chemigrams using a vast array of sometimes caustic chemicals.... none of them has stained the gray paint to my surprise. Silver Nitrite (Salt prints) has stained my hands several times but has had no effect on the paint.
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