I made some small aluminum backing squares for the rivets to hold. Once that was complete I scuffed both the vent and skin, mixed up a small batch of pro seal and stuck the air vents on. I left them to set up/cure with clecos hold everything together. I came back 2 days later and riveted the few rivets securing the vents. Many people just use the sealant, but I opted for a couple security keeper rivets in addition to the sealant.