Occasionally, a fat edge on a vertical surface will be thick enough for sagging to occur.
The terms fat edge and picture framing often are used interchangeably, but the latter is an obvious choice when the defect really does look like a frame.
This is an expanded version of a "Coatings Clinic" on fat edges and picture framing that previously appeared in JCT CoatingsTech in July 2005 (Vol.
The terms fat edge
and picture framing often are used interchangeably, but the latter probably should be reserved for situations where thick edges are formed on all four sides of a panel or part.
Irregular spraying can give thick spots that pop as do electrostatic spray wrap, fat edges
, or sags.
Snip or cut the fat edges
to prevent the steaks from curling up.
If there is too much flow, the result will be sagging on vertical surfaces and there may be other defects such as craters, dewetting, pull-back from edges, fat edges
, and sinks and bumps.