Sikaflex-ing the Canopy

Jon and I decided to use SikaFlex (glue) to attach the plexi-glass for the canopy and the back window. The process is a bit more difficult than the Van’s method of using screws. We didn’t like creating a stress riser at each of thirty plus holes in the plexi-glass.

The process is :

  1. Mask off everywhere you don’t want the primer to end up.
  2. Lightly scuff both surfaces (plexi glass with scotchbrite and aluminum with 220 grit sand paper)
  3. Apply Sikaflex 205 Activator (which seems to be roughly isopropyl alcohol) and let dry 10+ minutes.
  4. Create stand offs to prevent the plexi-glass from squeezing the glue out. I used tongue depressors for the front and rear and fishing line glued onto the sides.
  5. Apply Sikaflex 206G+P primer to both the plexi-glass and the airplane body. This stuff is very thin and can easily run. Thus the reason to mask EVERYTHING. It looks like alcohol will remove primer if necessary.
  6. Apply a bead of Sikaflex 295 UV to the metal surfaces. It is important to cut the tip of the tube properly and to build a small pyramid of glue.
  7. Lower the canopy onto the frame and weight it down with sandbags. I also installed the side skirts to keep the sides of the plexiglass tightly against the glue.
  8. Wait 24 hours.
  9. Remove the tongue depressors and add some additional Sikaflex to fill the holes and make a smooth fillet around the front of the canopy.
  10. Add the side skirts using the same process (remember to have the wire for the canopy open switch in place).

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