Yes that is correct, a single layer top up is usually all that is needed.  If you need to more aggressively clean the mould using mould cleaner or anything more aggressive than a damp cloth, then you risk stripping off the release agent so we would recommend fully cleaning to remove all traces and starting afresh to be on the safe side. 

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

If your initial pull went well with the coats already applied, adding a single additional one after each part comes out should work fine from here on. 

I have had a successful pull from first mould where I applied 7 coats of easy lease. The next time I use this mould is 1 layer of easy lease enough?