It Doesn't Stick !

Tape failure, or "it doesn't stick" can be caused by a number of factors:

1. Surface contamination:
   
   Just as you wouldn't apply a coat of paint on a surface that is dusty or rusty, so also you shouldn't apply a tape. Prepare the surface first, by removing contaminates that prevent a good bond from forming.  Abrading the surface and proper cleaning will increase the bond.
   
   
2. Low temperature:
   
   Cold temperature generally "hardens" the adhesive. This reduces tack and prevents a good bond from forming.
   
   
3. High temperature:
   
   Generally "softens" the adhesive. This causes a reduction in shear and tensile strengths. Adhesive tends to "slide".
   
   
4. Insufficient contact area:
   
   Poor surface contact, such as on a textured substrate, is also a cause for failure.
   
   
5. Poor surface compatibility:
   
   Surface compatibility plays a vital role also, where molecular migration can interfere with adhesive performance.
   
   
6. Inadequate application pressure :
   
   The simple act of not applying sufficient pressure can be the reason for tape failure.
   
   
7. Wrong tape for the job!
   
   Some applications are just not suited to tapes.
    
   To address those "it doesn't stick" problems, all that is required is the identification of the possible causes, and applying the basic principles that will ensure good tape performance to remedy the situation.
   
   So remember, clean dry surface, room temperature, pressure and enough of the right tape will assure you get the bond you need.