Any recommended products I can pick up at home depot to coat a Flyback ?
Something that's silicone ?

I'd go to AutoZone, o'riley auto or any other auto parts store and pick up some flavor of permatex sensor safe RTV silicone before I'd go to a hardware store. Most hardware store silicone releases acid as it dries and can damage electronics.

If it was an emergency scenario I might use GE silicone II from a hardware store on a flyback (I use it to reattach CRT safety glass after a cataract removal), but I'd still rather use sensor safe automotive silicone if possible.

i have used Red-X Corona Dope , but you cant get that at HD, :(

They actually make corona dope these days ?

They actually make corona dope these days ?

yes, we use it here at work even! :)

They actually make corona dope these days ?

Yes, you can even find it at Amazon:

https://www.amazon.com/AmplifiedParts-Corona-Dope-2-oz/dp/B00E1QZ2SY/ref=sr_1_2?crid=2M9NGTEI8ASWQ&dchild=1&keywords=corona+dope&qid=1619463965&sprefix=corona+do%2Caps%2C262&sr=8-2
https://www.amazon.com/MG-Chemicals-4228-55ML-Insulating-Varnish/dp/B008OA7DDK/ref=pd_sbs_2?pd_rd_w=Z3wUz&pf_rd_p=2f278529-0216-4b0b-87bc-29d98b4b6ca6&pf_rd_r=AG8EHZE3ZXCPNNZEV4VY&pd_rd_r=33db7b53-4056-4a3a-b6f3-3528f13ae96d&pd_rd_wg=QvjOH&pd_rd_i=B008OA7DDK&psc=1

not affiliated,
jr