I work in the autobody industry. This is a seam sealer tip that replicates factory seam sealer bead texture in the structural portions of a car. : r/functionalprint
Resto Tech: How To Apply Seam Sealer Correctly!
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Car Body Seam Sealing
a) Sealing material applied to a car body with the hollow-cone nozzle... | Download Scientific Diagram
Applying brushable seam sealer to your Classic car project - YouTube