Abstract: Provided is a surface-protective coating composition capable of forming a surface-protective coating film in which the occurrence of cracks is suppressed during the formation of the coating film, while using a polymer having marine biodegradability. Also provided are: a surface-protective coating film formed from the surface-protective coating composition; a substrate with a surface-protective coating film, which is coated with the surface-protective coating film, and a method of producing the same; and a surface protection method using the surface-protective coating film. The surface-protective coating composition according to the present invention contains a polycaprolactone-based polymer (A) and a zinc oxide (B), wherein the polycaprolactone-based polymer (A) has an acid value of 5 mgKOH/g or more and 200 mgKOH/g or less, and a structural unit derived from caprolactone in the polycaprolactone-based polymer (A) has a content of 50% by mass or more and 99.5% by mass or less.

Abstract: A low-VOC coating composition, a coating film, a substrate with a coating film, or a method its production, may include a low-VOC coating composition substantially free of benzyl alcohol. The low-VOC coating composition may include: a bisphenol epoxy compound (A) having an epoxy equivalent of 200 or less; a liquid amine curing agent (B); and a dioxolane derivative (C) of formula (1): wherein R1 and R2 are each independently H, an alkyl group, an alkenyl group, or a phenyl group, and n is 1, 2, 3, 4, or 5.