One of us is confused, maybe it's me.
My understanding of the problem is that the pressure of the oil stream causes the sump screens to break and allows everything, oil, gunk, metal bits and plastic bits to flow through the screen without being filtered. Next stop, the oil pump.
My Sump Screen Shield diverts the oil flow and protects the screen allowing it to do its job of pre filtering the oil. I see no need to seal the edges.
As a matter of fact, sealing the edges will reduce the filter area. My sump screen shield protects the screen without reducing the filter area. And while these filters are plenty big, any reduction in filter area will reduce the overall service life of the sump screen requiring that they be changed more often.
The best thing about my Sump Filter Shield is that it can be reused for as long as you own your XS and will probably outlive you and your XS without any modification to your bike-- it simply bolts on.
And if gunk does get around it then the gunk will be caught and kept out of the oil pump by the screen that remained intact because the Shield prevented it from breaking.
So to answer your question, I recommend you don't seal the edges.