Defect at mask edges where the coating builds up over both the part and the tape or shield, joining them. When the mask is removed the coating tears unevenly or peels back from the edge of the coated area. It is prevented by using shadow masks held slightly off the surface, cutting the coating at the tape line, beveling the edge, and pulling tape soon after spraying.
Bridging over the tape on the flange, pull it slow and score the edge with a blade first.
Also heard as
- bridged
- bridging over
Related terms
Masking
Covering areas of a part that must not be blasted or coated, using tapes, plugs, shields or maskants.
Tape
Masking tape used for blasting and spraying, or as a verb, masking a part off before coating.
Lifting
Shop word for coating peeling up at an edge, often after tape removal, grinding or machining.
Undercut
A recess deliberately machined below finished size so the coating can fill it to full thickness.