It's also worth knowing that if you mix basic type putties with acetone (nail varnish remover), you get a thinner, runnier putty which is very good for applying with a paintbrush to joint lines, small areas precisely etc etc.
As always, test out on a piece of scrap first to get the hang of it!!
HTH and enjoy your modelling - I'm new to this too and it is well worth the effort just browsing and surfing the web and the forum. There's tons of gems of info buried in there, you just need to be creative in wording your search queries in different ways