Re: Prop size for 4-107
FWIW, it's generally considered a bad idea to use bottom paint on your underwater running gear (i.e., prop & shaft.) It may seem a little counter intuitive, but you'd be much better off leaving the metal bare than coating it with anti-fouling paint.
Why? The copper in the paint doesn't play well with the bronze and stainless. Underwater -- particularly saltwater -- you are establishing a small galvanic cell that will leech the zinc out of your bronze and accelerate corrosion of your stainless. Take a little time to read up on galvanic corrosion; it's well worth your time.
There are products specifically designed for props and shafts, but they can be pretty spendy. PropSpeed gets lots of great reviews, but get ready for sticker shock. Do some internet window shopping for underwater metal paint to get a better idea of the alternatives.
Personally, I'd recommend just leaving the stuff bare. If you use the boat often, just running the engine does a pretty good job of keeping the metals relatively clean. If you don't use it often, then giving the prop a coat of anhydrous lanolin before you splash will help some.
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'85 BYB Vagabond 39