A final application of oligomer 1 was to use it as a protective coating for aluminium. Previous studies have shown that sulfur polymers are resistant to acid, but there remains a need for a generally solvent processible sulfur prepolymer to facilitate deployment in coatings applications. We therefore evaluated if oligomer 1 could meet this need. Accordingly, small amounts of cured 1 (57-77 mg) were tested for acid resistance first by submerging it in HCl, H2SO4, HNO3, TFA, H3PO4, or acetic acid. The polymers were removed after 24 hours, rinsed with deionised water, dried and weighed to determine if the acid had dissolved or degraded the cured polymer. Only two acids showed any effect on the polymer. Sulfuric acid dissolved 3% of cured 1 in 24 hours and nitric acid dissolved 6% in 24 hours (S66). This was a promising result and showed that the polymer is only minimally affected by a range of acids, including the highly aggressive and oxidising sulfuric and nitric acids. To test the acid resistivity on a polymer coated piece of aluminium, 1.0 g of oligomer 1 was dissolved in chloroform (2 mL). A 100 µL aliquot of this solution was then added to the surface of aluminium wafer (1 cm 2 ). After the solvent evaporated, the coated metal was cured at 140 °C in an over for 24 hours. The final coating was 30 mg in mass. The cured polymer has a smooth, black finish and adhered to the metal (Fig 4a ). To test for acid resistance, HCl (37%, 5 µL) was added to the surface of the polymer. After 3 hours, the acid was washed away with water. No reaction or corrosion was apparent by inspection (Fig. and). In contrast, the uncoated aluminium corrodes rapidly upon exposure to the same HCl solution (Fig. and). The cured DCPD sulfur copolymer was clearly resistant to acid, providing a protective coating for the aluminium wafer.