Conformal coating on Samsung U32D970 monitor PSU, do I need to replace after repair?

[psyduck]

I have a Samsung U32D970 monitor from 2015 I pulled out of the bad hardware pile that turned on and then turned itself back off after a few minutes of use and refused to turn back on. The PSU has part number BN44-00786A, and I found a couple posts about one that had blown with damage to the MOSFETs and PWM controller - but nothing about intermittent failures. I started a new thread and said that I would refresh the solder joints on the board to see if it was just a bad connection and possibly replace the PWM and PFC ICs. I then asked what my next course of action would be after those steps. I got a couple replies back from Francesc V. and stj to check the small caps, but the maintainers of the forum upgraded the site the next day and the entire thread was lost.

I resoldered the joints on the SMD components for both the PFC and PWM sections of the circuit, along with the power MOSFET connections as I planned to do and now have a working monitor. I guess that a solder connection was marginal and that refreshing it fixed the problem.

The original board had what felt like a silicone conformal coating applied to the copper side over just the PWM and PFC areas of the circuit. I had scraped off most of the coating with my fingernail and x-acto knife and used a stiff plastic brush to remove the rest. Is it important to replace the conformal coating? There are no exposed copper traces and it's not in a high-humidity environment.

[CapLeaker]

That silicone is there that dust and dirt etc. can't build up in between the pins and start arcing over while swinging 380V or so. Would I replace that silicone? A very high probability of NOPE.

[sam_sam_sam]

If the green coating comes off and you are in the high voltage section you can put finger nail polish on I have done this in the past and it does work but only put on the traces and nothing else

One note you do not need to make it real thick you just need to cover the copper traces so the copper is not showing
also need to make sure that the copper is very clean for the finger polish to stick on the copper

I had to do this once on a servo drive switching power supply that the electrolyte from a couple of capacitors eat away the green coating under the capacitors clean it up with water and a cute tip until It was as clean as possible then used a green scrubbing pad to get the copper to shine then put the finger nail polish on the copper traces put in new capacitors and to this day it still is working in this machine

One other note I have had this happen before and it was not in the high voltage section of this board and just cleaned it up really well and left it like it was without any coating and this works very well