If you’re sailing in shallow water in strong winds then it is a good idea to prevent the mast from digging into the mud in any boat (I brokle a Laser mast like that).
While the Hobie mast flats may be effective, there are automatic inflating alternatives that are less intrusive:.
http://www.grabner-sports.at/Masthead-float.1675.0.html?&L=2
http://www.marinechandlery.com/secumar-auto-inflation-anti-inversion-mast-float-15917
But first of all I’d suggest testing the volume of buoyancy it provides (using plastic containers) to ensure it does the job.