Frameless tint needs the glass locked up for shrink and edge work. DoorDumb sits between that glass and the trim so an accidental door close hits the tool — not the window.
Raise the window to the working position — usually fully up / “locked up.” Heat shrink, edge alignment, and full-surface film work need the glass seated high. You cannot finish a clean frameless install with the glass dropped into the door.
Insert DoorDumb between the glass edge and the interior trim. Confirm it is seated and stable. The tool creates a controlled gap — a mechanical buffer — in the exact zone where a closed door would crush trim into glass.
Heat-shrink film, set edges, squeegee, and finish. If a coworker, customer, or you bump the door shut, DoorDumb takes the compression instead of the glass edge or trim clips. Work continues. Glass stays intact.
When the window is ready to lower and the install step is done, remove DoorDumb. It is a preventative bay tool — treat it like cleaning glass or cutting film: every frameless door, every time.
On frameless and semi-frameless doors there is no full frame around the glass. When the window is up and the door closes, interior trim and seals drive straight into the glass edge. That edge takes the load. One slam can crack tempered glass, bend trim, break clips, stop the job, and turn a tint ticket into a glass replacement conversation.
Installers keep the glass locked up on purpose: shrink needs the film on a raised, accessible surface, and edge work needs the top of the glass where it belongs. Lowering the window mid-job is not a safe workaround — it kills the install quality. Protection has to live with the locked-up window, not instead of it.
Door closes. Pressure happens. DoorDumb takes the hit instead of the glass.
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