If it's the gap between the ever flexible wooden box-out and the pretty rigid plaster wall or even gaps between wooden sections, then I'd use decorators' caulk which can be called flexible filler. It comes in a mastic type tube and is applied the same way. It's water soluble and develops a skin in less than an hour. It's much easier to use and clean up than any silicon material.
My method is to stick it on the end of my finger, rub it into place and wipe off the excess with a damp cloth.
Last edited by: Dulwich Estate on Thu 10 Mar 11 at 12:17
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