I've been repainting my kitchen cupboard doors using dulux satinwood,
since none of the kitchen makeover paints were available in the colour
I wanted.

To give a hardwearing, washable finish, I thought I should then add a
few coats of varnish. However, the varnish leaves a patchy,
grubby-looking finish (even when using brand new brushes) which makes
me wonder whether it is incompatible with the paint below.

Does anyone know if this is likely to be the problem, and more to the
point, what kind of varnish I should be using?

Thanks

Bob