And when you sell them replacement bricks, charge at least 3.2 times what the board cost you, including the potting material. You won't get much salvage use out of bad boards once they are potted.

The board I posted the URL on has one advantage regarding potting materials: its through-hole components constructed.

Without talking about the physics and chemistry of potting materials, surface mount technology components are much vulnerable to the selection of materials. You have to use the right materials for SMT or else temperature expansion ad contraction of the material in temperature ranges will actually shear the component from its soldered connection. Materials are readily available for SMT, but its important to use them if your board has SMT.

Luckily my father is a plastics chemist and did all the research on this stuff before we selected my company's approach.

aka J