The thing that is nice about Capt. Tolleys is that it wicks deep onto the rivet hole and fills the empty voids. Thicker sealers can only provide a "cap". I decided to seal all my roof rivets while doing spring maintenance last year. All but 3 rivets "puddled" immediately, indicating no porosity. Three rivets displayed the Crack cure being "absorbed" below the surface. I had never seen or suspected a leak, but there was most probably a seep.
After 2 - 3 applications of Tolley's, the rivets were sealed and the last application pooled up on the surface.
"If the women don't find you handsome, they should at least find you handy." - Red Green