Hi Des.
This is a taking a bit for you to grasp what I am saying so I will try another approach.
I don`t use any special primers or undercoats as the first coat on to bare wood as I said previously wood is a naturally porous
material so I just use the gloss paint as an undercoat and you will find the bare wood will soak it up like a sponge.
If you want to go for primers and undercoats you go ahead mate as there is no right or wrong way to go about this.
I just go straight in with the gloss paint as it waterproofs the wood immediately and gives it a hard shell like enamel.
I am not sure about primers and undercoats for bare wood as I dont think the are absorbed into the wood grain the
way that the paint is I thought they more gave a surface base covering for gloss paint to be applied on to.
I am generally a brush man when it comes to wood, spraying I reserve for the GRP stuff, but if your a spray man then
go for it if thats what you feel comfortable with.
I go to a DIY warehouse like B&Q and select the best gloss paint they have quite often the have the international
brand paints/ varnishes which would be ideal for you as they are used by the full size yachties.
http://iyp.yachtpaint.com/uk/ Going back to a question you asked earlier about glassing the outside of the hull. In my oppinion if you glass the
outside of the wood hull then you have got a GRP boat. If you glass the inside you still have a wooden boat
and the boat retains its character if you see what i am getting at.
here is a link to look at
http://www.vmyg.org.uk/pages/gallery/whatis/dainty.htm cheers Frank