can be pretty hard to sand if it's tongue n groove or square panels with moulding but for this job i usually sand every part to roughten it up and then wipe it down with a meths rag and then coat in white shellac based paint (zinsser BIN) cos that sticks to anything (even the bits you miss with the sandpaper!) and provides a sound surface to paint on and it also takes knocks so your top colour wont come chipping off later.
gillian
November 2009
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