This is what I use, reccomended by @b264
MG Chemicals 419D Premium Acrylic Conformal Coating, 55 mL Bottle, IPC 830, UL 94V-0 (File # E203094) https://www.amazon.com/dp/B07B8RY7M6/ref=cm_sw_r_cp_apap_AVCnHgxmhsGOn
I reccomend you find one with a brush on the inside of the cap so you don’t have to be like me: