The paint should be fine, just prep' well and take your time. How are you thinking of applying it?
As for the filler, if you check out Stavros' paint thread, you should find the name of his recommended filler, which is apparently easier to sand than P-38 - Thus reducing the risk of accidentally sanding away the wood, which is a possibility when using a harder filler (i.e. P-38).
Bear in mind, the responses may be a bit slower today as several of the lucky b****** are playing at Wicksteed.
Andy
p.s. I've modified the title of my reply in this thread so that it attracts the attention of the Wicksteed chaps and chappesses