Hi,
I might be wrong but I sem to remember the 11" flexwat having instructions not to cut it in sections less than a foot long?
If you wanted 6" panels you should really have bought 6" flexwatt or doubled up 3" or 4"
Also I am a little confused - are you talking about cutting across the flexwatt in your post or from top to bottom?
I.e. between the lines or across the lines between the two edges?
dr del