My technique for applying RTV (liquid gasket) between two surfaces (say gearbox casings or oil sump or timing cover) is to run a bead all the way round about 4-5mm high and then flatten it down so it's uniform and about 1-2mm high. I know some people wouldn't flatten the bead but the only time I didn't do that recently actually led to a leak. The other thing I've realised that what I don't do is leave time between putting the two surfaces together and torquing up the bolts. I should wait for sometime for the sealant to start to cure before torquing. But again I've never had an issue with anything leaking. So I'm interested in hearing how other people apply liquid sealant, to see if I can improve upon the technique. @Beefy would be good to hear how you do apply it also.