I personally think a well made system doesn't need knot sealer.
As for positioning spray, there's no need for that. You can spritz with isopropyl if you choose to use this method. A FAR better method (if you use tape) is to attach the tape to the system first, leave the backing tape on it, then spend as much time as you need getting your system into the perfect position. Next, put an Alice band on your head to keep the system in place. This will then allow you to use 2 hands to peel off the backing tape from the tape, and attach one section at a time (start from the back, then do the sides, and finally the front. With this method, the front can still be attached with either tape, glue or a combination of the two). This method, when perfected, gives you a perfect and consistently placed attachment every time.
Using the positioning spray method doesn't give you long to get the system in place before attaching it - only use this method if you're doing an all adhesive attachment, otherwise if you use tape then try the Alice band method.