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
Dynatron™ Auto Seam Sealer Caulk | 3M United States
Car Body Seam Sealing
SEM Products Unveils Seam Sealer Solution - BodyShop Business
HB Body 115 Autoseal Brushable Seam Sealer
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3M Dynatron Auto Seam Sealer Caulk 550 Grey 12 Oz for sale online | eBay