Surface preparation is by far the most important factor, after using the correct adhesive, in achieving a strong and lasting bond between two surfaces. Virtually all unexpected bond failures we have heard about have been traced back to inefficiencies in this area. There are three stages to surface preparation; 1; Remove any loose contamination. This will involve using various solvents and abrasives, depending on the condition of the substrate 2; Key the surface if possible, using a micro-abrasive such as Scotchbrite 3; Prime the surface if necessary using a primer or specialised surface treatment. REMEMBER the adhesive sticks to the SURFACE of the material. If the surface is greasy, or dusty, or loose filaments, or flaking off, the bond will fail.