Methods and compositions for coating a substrate with at least a basecoat layer and clearcoat layer allow quick repairs to damaged vehicle panels under ambient temperatures and without requirement of actinic or thermal radiation to cure the layers. At least one basecoat and one clearcoat layer may be applied to a substrate and the clearcoat layer may be buffed with less than 30 minutes allocated to curing the basecoat and clearcoat layers, under ambient conditions, prior to buffing. Methods and compositions are also taught for coating a substrate with at least a primer layer, a basecoat layer, and a clearcoat layer, in which the clearcoat layer may be buffed with less than about 45 minutes allocated to curing the primer, basecoat and clearcoat layers, under ambient conditions, prior to buffing.