I did the film negative trick before, but it came back after 18 months.
Used the new Seal Mate yesterday, the right way, taking off the fork guards and lowering the dust seals. The fork guard nuts inside the fender are tricky to get to (done only by feel); you use a 1/4" stubby handle 10 mm socket to reach the lower 6mm flange nut, and a 10mm ratcheting box wrench on the top one. The nuts are not parallel to the fork, they are crooked and tricky to get a tool and your fingers on (and mine were pretty corroded, cleaned up and plenty of antiseize applied).
On both sides, the top nut fell into a pocket in the inside fender mounting bracketry and was hard to poke out of there. Working the sealmate around the fork seal causes new oil to flow and had to be cleaned up as I went or the seal mate was too slippery to continue moving. Also, trying to bounce the forks, after cleaning, was difficult. I cannot stand beside the bike and get any bounce out of the forks... had to mount the bike, stand on the boards and bounce hard enough to dance the kickstand around. Did that and wiped more oil off until no more flowed on each side (4-5 times). Then went for a ride, and had more oil at the first stop (and cleaned), but thereafter had no oil of any kind. Need a few hundred more miles to see if I have problems that the seal mate cannot fix (like a torn/damaged seal).
If you find you must rebuild the forks, get
every wear part in the forks for a proper rebuild, not just the lower seals. I have a bag of them when I need them, about $120 or so. If (when) they do need rebuilt entirely, I will pull the forks off myself and take them to somebody who knows what they are doing. Labor for the whole job at a dealer may be around $600, my guy will rebuild the forks I bring him for $100.
Do like the video in the website. (Believe me, the valk is not as easy as the brand new dirt bike in the video) This is a $3 part with $5 shipping that every valk owner should buy and have on hand (and maybe keep in the tool kit). It does not fold up and self destruct like a piece of film negative does, repeatedly.
http://sealmate.net/