I would be careful using silicone since it is highly permeable to water vapour. Mutch more than epoxy or PUR since its a water vapour setting product. Silicone will set by the water vapour in the air this is why it sets slower in a lower humidity or quicker in a higher one. This is also why a silicone tube eventually cures all the way once you open it. A two component silicone would still have this but maybe less depending on the type. For epoxy’s, this is mostly much less since an epoxy sets by a chemical reaction and therefore doesn’t have to be designed to let a water vapour trough like a silicone.
I have tried to look online but could find a conclusive test with scientific results between epoxy and silicone.
I found this text by Dave. SR = silicone rubber
Many people do not know the following. Others will refuse to believe it:
Note that SR’s are NOT water vapour proof. Water vapour will permeate through them but liquid water will not. So a container “sealed” with SR will have an internal relative humidity comparable to that outside it! SR is typically about 10x more water permeable than the EVA sealant/adhesive used to bond silicon “solar cells” & glass PV panels together. So a glass-fronted PV panel and a “waterproof” backsheet is also not in fact sealed and inside humidity levels are ~+ outside ones. Keeping LIQUID water off your components is what is required to prevent major corrosion. Fortunately.
Corrosion still occurs with water vapour but at a vastly reduced rate due to the much lower concentration of reactants.
The other requirement is a void-free bond to the component. If there are voids then water vapour can condense to form liquid water and allow corrosion at greatly accelerated rates.
Thus using SR for the LCD would be risky since the LCD/OLED is highly sensitive to water!