The only thing I could find on the statement that I made on roofing tab sealants that might be wrong was this.
To stop the initiation of damage, it is imperative
to keep the exposed shingle tab sealed to the
shingle below and to the rest of the roof deck.
Applying roofing cement to the outer roof edges
by hand, properly locating and applying nails in
shingles and taking care to assure the shingle’s
self-sealing adhesive strip is properly secured will
help keep the tabs from lifting. The guidelines
include practices to reduce shingle blow-off and
improve water resistance if some of the tabs are
Read the instructions on the Certinteed Roofing being applied on my job today, and it was a 30 year Architectural, and stated what I said in my post, but was only for high sloped roofs which is 21/12 or greater.
Some where along the line I have come across the fact that 6/12 or greater needs this additional tab cement. It might have been a cheaper or less expensive shingle. When I find which one it was, which would mean me stumbling on it again, I will inform you.