If this motor has a similar carburetor to a “T” series motor, then the best solution, by far, is to replace the float with a modified Mercury float. Then you will have a modern plastic float that is fuel resistant.
I have read many of these threads on coatings for cork floats, and for every product that gets recommended, someone has a negative experience. Some of the problems with coatings may be due to a lack of curing time, and/or lack of preparation.
Improvise-Adapt-Overcome
