Backbone molecule of gutter perch a and they were able to bond a UDMA resin on onto to the backbone of this gutter perch in other words this the there is a very thin resin coating that is bonded. Onto the gutter perch itself this very thin resin coating is actually very similar in chemistry to the end arrest sealer and therefore this resin coating actually bonds to the end arrest so when. You finish the alteration you have gutter perch in the center a resin coating is bonded to the gutter perch a and then the resin coating is also bonded to the end arrest than the end arrest.
