I don't compete in cyclocross events, but I do commute through piles of snow, gobs of mud, and deep puddles. A recent inspection of my cloth rim tape showed it to be partially encrusted in sand and salt crystals. I'd rather not have this stuff inside my rim.
Do any of you use veloplugs instead of rim tape? Does it do a better job of keeping junk from getting inside the rim? All of the discussions of veloplugs I've read in these forums are centered around weight savings. I could care less about a few grams. I'd just like to have better protection for the inside of my rim when I ride into a deep salty mud puddle.
Sorry if my wording was ambiguous. I shouldn't have said that I want to keep stuff from "getting inside the rim." I should have said that I want to keep stuff from getting through the rim and onto the tube, which, as this pictures shows, veloplugs might do.
I've never heard of anything feasible that seals spoke holes. I guess you could tape or seal the valve hole but doing that for every spoke would be a little nuts.
Have you actually had trouble with stuff soaking through the rim tape and harming the innertube? I've had water-filled rims and the worse that came of it were those little sandy dots on the rim side (i.e. sticky side) of the tape. I suppose if you stored a bike with a water-logged rim and a flat you could have problems, but I'm not sure the veloplugs would do any better in that case.