I used RTV last time I changed my front fluid (couple times a year- was have mucky swampy trails with river crossings) I put the bead on then started to do something else for it to cure for a while.
The next day when I remembered I never put my ARB cover back on my front diff I decided against cleaning it all off and starting again. Figured it would act like a lube locker gasket (and hopefully not stick to both sides when I pull it again). Been several months and not a drip. :-) I did have a nice consistant bead though- if it had been a bad one I would have probably started over again.
1994 Jeep YJ : 3.75" of lift, 4.56 gears, 8.8 w/ lsd, 34X10.5 TSLS and some other stuff. 4 Angry Squirrels and proud!
1981 (with some 80 and 84 parts thrown in) CJ7 under restoration. SBC 350, 2.5" lift, half hard top and lots of fun!