I have tried using the grip to seal the inside corner of steel to steel with silicone. The reason for using the tool was for further reporting. Didn't like it at all. Although it added about 4 inches to my reach, it was difficult to manage and didn't give me the pretty bay I was looking for. I ended up climbing in and using the blue pieces I had used before. Bevel or bight shapes and are easy to handle. I wear disposable gloves and clean the tools with white spirit. They will wear out over the years. But I've certainly seen them last 5+ years with heavy use (waterproofing, dozens of windows, etc.).
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