Go to your local aircraft parts supplier and buy some epoxy prop paint.
The best, cheap fix for erosion. Won't stop it, but you can see how fast it is coming off, and restore it in no time flat.
The field fix in ultra rainy locations is the Stainless Steel tape you can buy from JC Whitney - the best tape ever produced. None of this is approved, recommended or endorsed, just happens to work superbly well!
