Fantastic fan PWM control board conformal coating: yes/no?

[ri-f]

If you've done the Fantastic Fan PWM control board hack, did you use a conformal coating on the PCB, or did you leave it uncoated? And how has the board held up over time? Also, if you did use a coating, other than the heat sinks, what else did you mask off?

I'm basically referring to the popular RioRand PWM variable-speed control board, which I don't think is conformal coated
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https://www.amazon.com/dp/B08BNF3FZD?psc=1&ref=ppx_pop_dt_b_product_details


Rich