Thanks Dave, I was considering that myself....
The spray fabric glue such as those from Wilson Art etc... are very liquid.
As such I was considering spraying through a tube as with WD-40. As the two the small sags are half the size of space on which I am posting this message and by the edge of the liner I am thinking I might get away with the minimal repair....
So, you don't think the idea of shrinking the fabric with a hot hair dryer has much merit?
Especially being such a small spot.. I realize that the Hot Hair Dryer could possibly unglue even more of the liner. Keeping that in mind I was hoping to to find someone who had already made the attempt..