Yes this would provide a protective surface for your paintwork.

A 500ml can should cover approximately 1 square meter depending on coverage required. Your may require several cans to lacquer an entire car.

Halfords Universal Clear Lacquer 500ml is acrylic based.

Yes.

Lacquer will not adhere well to polished alloy sufaces. An "adhesion promoter" spray layer would help the lacquer to stick but would also dramatically reduce the shine of the polished surface.

It is best to rub down any peeling laquer first to avoid further peeling. Each coat can only stick to the coat underneath it and if that coat comes away then so will the top coat. The edge of the repair will need blending in to the surrounding area to avoid a visible line.

The lacquer has a gloss finish. The standard of results depends on how well the surface has been prepared at each stage of the painting process.

It is advisable to lightly abrade the paint surface with fine wet and dry paper to remove any imperfections and also help the laquer to adhere.

This lacquer has not been approved for use in food contact areas.

Yes, it would be fine.

Universal Lacquer can be used on wood and it will be compatible with acrylic finishes.