The aim of this study is to compare the marginal leakage of light curing nano-glassionomer cement restoration with and without unfilled surface resin sealant coating when used for cervical cavities. Also, to evaluate the solubility of nano-glassionomer cement restoration when used with and without unfilled surface resin sealant coating. Materials and methods: for microleakage testing, standardised class V cavities were prepared on the buccal surfaces of 20 sound human upper premolars. Half of the cavities (n=10) were only restored with nano-glassionomer restoration, while the other half (n=10) were restored with nano-glassionomer restoration coated with one thin coat of unfilled surface resin sealant. The restored teeth were placed in methylene blue solution for 24 hours. Then the teeth were sectioned longitudinally and analysed for dye penetration length using Image J software. For solubility testing, a total of 20 nano-glassionomer discs were prepared. The discs were classified into two groups; 10 discs were coated with two layer of the unfilled surface resin sealant while the other 10 discs were not coated. Solubility assessment was based upon modification of the ISO 4049; 2000 specification. The results showed that nano-glassionomer coated with unfilled surface resin sealant group recorded non statistically significant lower dye penetration mean value (2.943 ± 0.09659 mm) than the uncoated group (3.251 ± 0.1241 mm). For solubility, nano-glassionomer coated with unfilled surface resin sealant group recorded non statistically significant lower solubility mean value (2.054 ± 0.4987 %) than nano-glassionomer uncoated group (2.374 ± 0.06505 %). Conclusion: coating the nano- glassionomer restoration with unfilled surface resin sealant slightly improves but did not completely eliminate microleakage, nor prevent solubility of the nano-glassionomer restoration.Key words: Nano-Glassionomer, unfilled surface resin sealant, micro-leakage, solubility.