The present disclosure is directed to a surfacing tool for repairing a sealing surface on a fitting. The surfacing tool is defined by a tool head and a tool head guide having an internal bore sized to receive the tool head. The tool head is includes a reverse flare working surface positioned at a first end thereof. A threaded element is positioned at one end of the tool head guide to threadingly receive a threaded flare fitting. The tool head being rotatable within the tool head guide while engaging and grinding the sealing surface on the fitting to a desired finish.