Randy,

Go to your local appliance repair shop and order Maytag washing machine door
seals. Buy two at about $5.00 each.  You will use about one foot of the
second seal. It is a neutral color like light gray. The cross section is
like the letter S with the top halfof the letter flattened like a Z.  Glue
that flat side on the aft side of your canopy reinforcement arch at an
appropriate position with the free tail of the S pointing into the cockpit
so that will contact with the fuselage forward face of the rollover brace
when you close the canopy.  The cabin pressure will push the seal against
the fuselage forward face and give you an airtight seal. There is no rolling
of the seal, It is out of the way thus unlikely to be damaged when crawling
in and out of the cockpit and leaves no marks on the fuselage.

Bob Smiley
N94RJ