Do not smear sealant over a torn Vanstone edge and install it under pressure as if the flare is sound.
Check
Inspect the full circumference of the flare for splits, folds, thin spots, or out-of-round shape.
Check whether enough straight duct length remains to trim and re-flange.
Verify ring/gasket fit and whether the joint is high-pressure or special system.
Check if the damage came from tool setup, cold metal, bad support, or wrong material.
Ask before shortening a section that affects layout length.
Steps
Inspect the full circumference of the flare for splits, folds, thin spots, or out-of-round shape.
Check whether enough straight duct length remains to trim and re-flange.
Verify ring/gasket fit and whether the joint is high-pressure or special system.
Check if the damage came from tool setup, cold metal, bad support, or wrong material.
Ask before shortening a section that affects layout length.
Say this to your foreman
The Vanstone flare on this round section is torn at [location]. I checked ring fit and remaining length. Do you want me to trim/re-flange it, replace the section, or send it back to the shop?