Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Ok Andy I'll slip this in. First there are two basic types of glue used here. 1). Two part cyanoacryalate with spray activator. Benefit to the stretcher: fast. Deficit to printers: sensitive to the very slightest of bows and dips; even in micron measurements. More prone to lose adhesion. 2. 2- part laquer. Deficit to stretchers: slower, glue has a pot life. Benefit to stretcher: less sensitive to dips and bows. Benefit to printers: Longer screen life. (Important to know these products are usually offered in high mesh and low mesh viscosities.)Second, it appears that the pre-abrasion of the frame is either poor or non existent. Often skimped on due to cost this is a critical step. The optimum way to achieve the best and most uniform abrasion is bead blasting. Most frame providers do not provide this service any more because it's a price war game out there. Grinding is inferior unless you have a Grunig or Harlacher unit designed for this specific purpose.That'll have t do for now