Welcome to MBM
Ben.......you will find many great builders references here......however just a few questions firstly
RC yacht...broad variety......do you have a design type?...scale or displacement?
Plans can be considered essential for a 1st build....& subsequent builds
Balsa wood is a light wood but very soft ......plans will often recommend the type of wooden planking required
Z-Poxy when thinned is an excellent method of reaching & penetrating internals of timber builds
You must really check their specifications for the concept of painting over Z-Poxy
An Australian Company called
Float a Boat in Victoria have an informative WEB site...[good people to deal with]...they have every conceivable requirement for a model yacht build .....from plans to wood to Z-Poxy .....[no association....just a very happy customer of FaB]
http://www.floataboat.com.au/products.htmSpend some time in research it will pay dividends
Derek