On 09/11/2018 05:35, The Natural Philosopher wrote:

The problem is that that implies you can stop the filler a fixed
distance from the edge.

Across the 12" width of the central 12" square oak beams the shrinkage
is about an INCH

As other have mentioned try and get the filler as close as possible to
the final finish without having to sand down afterwards. Possibly don't
try to get the finish in one go - fill to below the surface, key this
surface before it sets and then a final thinner filler layer.

What I've found useful to get a flat surface for filling over distances
of 12 inches is a taping knife which has a long blade and can be run
over the existing wall and the plaster to ensure one is flush with the
other

https://www.toolstation.com/shop/Han...g+Knife/p25000

Toolsatan also do them in stainless steel and to 12 inches.

Plenty of cheaper/larger versions available on ebay


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