Carb Diaphragm PlastiDip patching conundrum

[dweomer21]

Hiya all,
So I'm a bit worried about the patching I did on my carb diaphragms. I used PlastiDip as mentioned in one of the repair tips, and everything went swimmingly until I started wondering about gas coming in contact with the PlastiDip. There was no note in the tip about which side of the diaphragm to apply it, or about how gas affects the stuff, so I didn't really think about it and applied to the underside where the worn places were most visible. I just now began to wonder if A) PlastiDip is impervious to gas (which it isn't - I just used gasoline on a stick covered in dried plastidip and it took it off in no time), and B) if the plastidip was NOT resistant (which it obviously isn't), does gas touch the undersides of the diaphragms? I know a bit about carbs, but not enough to know if gas ever contacts the underside or not. I am pessimistically assume that gas is constantly in touch with the undersides because of all the passages that come into the mini-bowl at the top of the carb body (not the main bowl that is at the bottome when the carbs are in the engine). Hopefully I'm wrong, because otherwise, I'm faced with cleaning off all the plastidip and re-applying it to the top side so that when the gas dissolves the dip, it won't fould up my carbs in two weeks flat.
Anyone have any ideas about this? If I have to clean them off and redo them, it will suck bigtime, but I'd rather do that than have to overhaul my carbs again down the road. Conversly, if it isn't going to matter, I'm leaving them alone .
Also, if this is the case, perhaps someone might want to edit that tip to point this out to future patch-jobbers?
Thanks for any help!
-Scott

[Ken Talbot]

There should never be any gas in contact with the underside of the diaphragms.
However, I'ce got to believe that there could be some amount of gas vapors up there. I would be inclined to tear them down again, clean off the curent plasti-dip coating, and re-do it on the top side. Chalk it up to experience.
BSTS....

[prometheus578]

I haven't tried it on diaphrams, but I use fingernail polish to seal stuff when doing carb work. From what I understand, acetone, not gas, dissolves the stuff. (Briggs and Stratton motors call for it to seal carb plugs)
Pick up several different colors at the Dollar Store. I use them to mark wiring harnesses and vacuum lines when disassembling engines. Check to see if they disolve in gasoline, as some are cheapies!

[Do Lee]

You can also use yamabond #5 black semi-dry sealer. I've used it on the inside of diaphrams and have had no problems.

[xssiveone]

You can also reinforce the tear/hole with a thin piece of latex glued on top of the diaphram.

[Geezer]

Do the repair with Yamabond 5 instead. It works great and the repairs on the slides in my bike are 2+ years old and doing fine.

Geezer

[Shuriken]

Best repair is a replacement - especially if affordable. I have tried plasti-dip several times with less-than-impressive results. Perhaps I was doing it wrong.

[gerkenbruce]

PREMATEX A2 Works great but nothing beets new Yamaha replacements.

XSivly
Bruce