This is what the instructions said:
"Home made blockout is made by simmering "Future" acrylic floorwax
in a pan on the stove until it thickens to a paintable consistency.
I add a little red food coloring to make the acrylic blockout visible.
Ammonia is the solvent for this."
I can't seem to find any info. on the ingredients of Future Floor Wax - hmmm - anyone else know what's in Future Floor Wax???
I'm a willing guinea pig though - I will have a go at it at some stage!!! I'll keep you posted.