In my experience using Cetol Light for three full years - and a Cetol Clear (gloss) for an overlap of two seasons - total of 2 clearcoats, never did I see any signs of it lifting.
The Clear serves two purposes; being a bit harder than the minimum base of 3 coats of the heavy body, semi-translucent Cetol, it provides a protective clearcoat and prevents a gradual build-up of solid body paint. At least one maintenance coat is necessary each year - so after a few years regular Cetol will become less translucent and more opaque.
The Clear however, is softer than varnish, so if it ever gets scuffed - retouch the scared area immediately, first with Natural (Light, or Original), then another coat of Clear. Otherwise the teak will blacken.
True Blue . . .
sold the Nauticat