Hi Geoff
Hopefully these pictures will help show what tools and materials I use for planking and creating the caulking effect.
I think I know what might be your problem, I'm using a solid graphite pencil not a wooden pencil with a graphite lead (you seem to get a better build up of graphite). I also rub the graphite on both sides of the plank and I allow the glue 'squelch' (for a better word!) between the planks before wiping it away. I then sand with a fine grade sandpaper, or these days, a sanding foam block to get an even surface. I then use a semi gloss (or semi-matt) varnish to seal it.
It takes some time as you have to sand the plank edges, rub with graphite, glue, sand, and repeat for what feels like an eternity buts its worth it. The pencils I use are available from places like Colemans and cost about £1.50 to £2.00 each. If you look at the pencil on the right you can see how much is worn away from a new one on the left. But this is the accumulation of three models being planked so far, so they are good value for money.
Hope this helps.
Hi Kenny glad you like her so far, at the moment she is my favourite model kit built so far!!!