not a big fan of sealer,it always forms pools in the low points whichever way you leave it to dry,and you never know if its covered everywhere,had a nightmare recently with a triumph tank which the sealer was coming off inside in big lumps,i nearly always comes off after time,just a good biodegradable rust treatment left for a few days and always keep your tank filled up when bike is left standing for long periods,as for indian tanks,i spent some time dealing with motorcycle dealers in delhi and can guess how they're made,so wouldnt touch them,look at the bullets,the standard tanks are machine made but when it comes to anything different like an ally tank,its made over here,