The present invention is directed to a colloidal (meth)acrylic polymer emulsion, wherein the (meth)acrylic polymer has a weight average molecular weight of 3000 to 8000 daltons, Tg of 110 to 140° C. and an acid value of 150 to 240 mgKOH/g. The present invention also provide a water-based hot stamping primer coating which comprises the colloidal (meth)acrylic polymer emulsion. The present invention further provides a hot stamping film comprising a hot stamping primer formed from the water-based hot stamping primer coating.