And don't use spacers.......
Cutting the tip to create a triangular bead is relatively easy. Sight down the end of the tip and imagine what shape you want to pipe, then use a new X-acto or similar. Practise on a cheap tube of Alex before hand with spare tips, that is what we did.
Spacers - your Safelite guy doesn't use them, he is using a similar product to glue your windshield in on your car. The triangular fillet is what is needed, the broad base gives a good fix onto the substrate and the 'peak' spreads out on contact with the canopy. What Sika say is they want an even 1/16 - 1/8" bed under the organic glass (perspex). Don't forget, they design 1 system for many applications. Spacers are a suggestion to create an even bed, but really only work on large flat areas.
We have done a 7 and an 8. I have sent snaps to a few guys on the forum, I must get round to figuring posting snaps one day as I could put a sticky (pun intended) thread somewhere.
Don't forget also, you really only mask the primer initially. The un primered area will release cured Sika like a booger coming off a kids nose
The second application of Sika to form a pleasing fillet must still land on the primer area and should not require further masking. Here, the trick is to use a tongue depressor stick (big popsicle) with a nice smooth sanded end to your desired profile. A deeeeep breath, a smooth and elegant swipe and the LEAVE ALONE.
A great product which gives a superb and resilient, professional finish. Yep, takes more time than drilling but a load less stressful and potentially expensive.