Pantyhose is quite often used in CL stunt but more as an aid to fine tuning although it works well as a filter. The BrueLine filters are quite good but in CL stunt the fine filter is known to give about the same affect as reducing the venturi size about .020" for better fuel draw. The coarse filter has the affect of reducing it by around .010". By using pantyhose in up to maybe 10 layers they then have a very fine control over the effective venturi size.

So for RC where the carbs are far too large, you can keep the dirt out and get better fuel draw as well . An "O" ring should be just the thing to hold them on.