We've just finished painting our new house, a job we thought would take a very long time, until we came across this gap filler, it can be painted in 5 minutes and is really light weight.
We just wanted to share this as we were able to complete filling the gaps and painting 1 week and 3 days earlier than expected. this product is definately the best we have come across for filling interior gaps.
http://www.holdfast.co.nz
search for product - 01410