This stuff does not cure well. Even with lighting it up for several minutes ( too long when in a tying rhythm) all I can achieve is a balloon skin filled with wet resin. I have been using it for wing cases on Perdigons and I am not using anymore than is necessary. I have tried layering it and curing each layer as I go ( again too slow) but still have wet resin and also delamination after use which creates a black mess. I even tried sitting my fly box in direct sunlight for an entire afternoon to bake them the rest of the way, this helped a little but the cure is still incomplete. I tried to research what might be going awry and discovered that Solarez also makes a coloured version of Bone Dry. I will switch to that instead. No black in the bone dry though, so I will have to rely on the old magic marker.