dvalle,
Don't Panic !
Having done a 7 tip up and an 8 slider, there are no real problems, but your prep must be meticulous and you really need help when doing it.
1. The whole canopy must fit - well !
2. Test fit with ratchet straps ($15 Home Despot ones are fine) to make sure it doesn't bulge anywhere when you put pressure on - you don't need much btw, just enough to make it all fit - the Sika does the rest. Make sure you have target reference points on the structure and the canopy - you will place this once and once only !
3. Mask where you want the primer and scruff up the canopy with red Scotch so it is completely opaque. Scuff the structure as well and mask accordingly.
4. Spacers - some do, some don't. We didn't and have had no issues. The spacers ensure an 1/8th bed, if you pipe correctly and don't apply too much pressure, that is what you end up with.
5. Get ready......
6. Practise the place and settle down onto the structure.
7. Figure out how to cut the end of the nozzle to create a triangular fillet - it isn't difficult and you may need to practise on a spare silicone tube but you can pipe a very nice triangular fillet.
8. No coffee. Don't want any caffeine shakes for the next bit.
9. Nearly ready.
10. Clean all surfaces - you can use their product or good panel wipe, very similar.
11. Now you become time restricted as you are about to start. Brush on the primer - it is the only thing the Sika will stick to. It flashes off very quickly - dries almost instantly. You have a couple of hours now or else you need to re prime. Prime both surfaces.
12. Get piping the adhesive on - just onto structure, just where it will touch.
14. Set the canopy down carefully, don't wiggle it, don't squeeze too hard.
15. Set your straps and make sure your fit is OK.
16. Now using a standard end nozzle, pipe a fillet on both sides of the structure in one fluid movement.
17. Using a tongue depressor of a suitable radius (insert this bit into step 2) dress the fillet again in one smooth movement. Your masking should be lined up with the edge of where your fillet will end and no more.
18. Go for a well earned beer and do not, I repeat DO NOT fiddle with anything.
After a couple of hours, it will have taken a first set and you can gently start to remove masking and using a sharpened popsicle stick with rounded corners, start scrape away the excess Sika that will not adhere to structure unless it is on primer.
Leave for a day or so and bingo - perfect canopy !
To the others - if I have missed a step, or if you wish to alter slightly, chime in please, that is how we did ours and got perfect fillets and edges on both.
Good luck !