So as i posted a few daye ago i had to replace a damaged prop,new one arrived and while its the same diameter it is larger than the old ones my question is would an alloy prop erode much after 20 years i do use the boat regularly but don’t know how many hours also being a twin setup will it affect performance much i dont want to do something that means i cant return new one if its not suitable or do i need to replace both props cheers