Hi there Bodger, how is Badger
First of all, may I ask what material your hull is planked with? If it is balsa wood, I use a trick, when working with hulls that have been planked with balsa. This trick is to first of all coat the hull with polyester resin with hardener mixed in. Then allow the polyester resin to cure, and, once cured then I fill with the bog-standard P38 filler. This process toughens the balsa up and avoids a situation of the planking sanding down before the filler sands down.
Also, I have several different shaped sanding blocks which I always use when I am going through the process of fairing a model hull.
Just another tip, if you are ever stuck for filler and have polyester resin and hardener - raid the Christmas talcum powders - the stuff that is put in cupboard every year :) and, what you can do, is mix a ratio 1 part polyester resin to 20 parts talcum powder. Once the consistency of the mix is like a putty, and smelling rather sweet ??? you can scoop out what you require and add the hardener mix. For those who are wondering, the majority of standard P38 fillers is just a mixture of French Chalk sweet smelling talcum powder and polyester resin with one or two thickeners added by the manufacturers.
Hope this of some help.
aye
john e
bluebird