A final varnish can’t be applied to an oil painting for six months or more, until the paint is completely dry through, or it will prevent the paint from fully drying. This varnish is perfect as temporary protection while waiting until the final varnish can be applied, and will give protection to a painting which is going to be exhibited or sold. A final varnish can then be applied on top at a later date.
Applying a retouching varnish in a spray makes good sense as there is no chance of disturbing the fragile surface of an oil painting that is only just touch-dry, with brushing on of a solvent-based varnish. But remember you will still want to gently remove the dust from the surface with a clean soft brush or you will permanently embed it onto your work with the varnish (dust usually builds up surprisingly quickly).
Please note, this product cannot be sent by air. Some European destinations may be accessible by road, but this will incur an additional shipping charge.