I used 3m 5200 marine adhesive sealant. Glued the solar panels down and sealed screws. Excellent product once it sets up its there for a very long time.
2020 Precept 34G,
600w 24v solar, Victron 100/50 -BMV712 LiBim 225 BB 200ah. Stehl Dolly, Safe - T- Plus. More to install