Amounts between 20 and 120 phr of an aromatic hydrocarbon resin were added to a solvent-based polychloroprene adhesive. The hydrocarbon resin was characterized using infra-red (IR) spectroscopy and differential scanning calorimetry (DSC) measurements. The properties and compatibility of the polychloroprene/resin mixture were studied using contact angle measurements, mechanical tests, DSC, thermal mechanical analysis (TMA), and theology. Tack measurements were also carried out, and the adhesion strength was obtained from T-peel tests on roughened styrene-butadiene rubber/polychloroprene adhesive joints. The addition of resin produced an increase in the contact angle, and a decrease in the mechanical and viscoelastic properties of the adhesives. For amounts of resin lower than 50 phr, there was adequate compatibility with polychloroprene, which could be the reason for the improved tack and practical adhesion of the polychloroprene adhesives. Amounts of resin higher than 50 phr produced a lesser degree of compatibility with polychloroprene, which was responsible for the reduced tack and lower cohesive properties of the adhesives. On the other hand, there was a decrease in joint strength which can be related to the change in the locus of failure of the joints, from an adhesional (for a resin content lower than 50 phr) to a cohesive failure of the polychloroprene (for a resin content higher than 50 phr).