Seam sealing with Sikaflex 227
Hi All,
My question is around seam sealing after priming. It is common after priming of a car to add seam sealant (like polyurethane Sikaflex 227) along edges to bridge the gap for top coating and prevent moisture egress. These can be used over any primer, and can be topcoated with PU. I fay sealed/wet riveted the lower skins of my fuselage, however not my wings or top skins of the fuselage. I am thinking that I would run a small seam along the edge of an overlapping skin, or where there is a butt joint, such as along the main spar where corrosion is common on certain types of certified aircraft. I have noticed on certified aircraft that there can be a significant gap between the overlapping skins (especially where 1/8" rivets are used), leaving the joint susceptible moisture entry. Has anyone done this (where they haven't fully fay sealed in a traditional sense), and are there any downsides (apart from time)?
Cheers,
Tom.