Not so much, just maybe 1" or so per 2 windows. In the long run the method is way easier for me. Gluing them in one by one just seems too tedious. Also, as a rule of thumb, I generally make each loop piece twice as long as where I would need to mount it, OR twice the length of the ship. That way I know that there will be enough. (I also got some super awesome bulk pricing for my fiber so loosing 10% for a job is OK with me)