You are getting a lot of good info here, from my experience the Sika you plan to use must be for the right application. it’s been a while but from memory Sika 252 is for bonding products together and if the two materials are different a certain amount of beaded Sika to form a “Sika gap” is required, for example when bonding aluminum onto fibreglass I used an amount of 252 to have the ally sit off the glass by 3mm, that way when the sun beats on it the ally will expand faster and more than the fibreglass but the Sika will allow for the movement, if no gap the seal between the two will eventually break.
Sika 252 is not uv stable so a sealant is needed to cover it, I used Sika 292 I think it was, Sika has tons of good info for different applications.
I like wood and have used it often trying to encapsulate it but invariably the epoxy will developer small cracks and start to let in water unless a fabric is used.The fastener will be a duct for access too and eventually rot that area, most wood that is kiln dried still has a high percentage of moisture in it unless you use a high quality marine ply but lots of $ these days.