The best way to seal Cyclocross Tyres? SeamSure v SeamGrip v Copydex

I may have finally found the best way to seal quality CX tyres like Challenge open tubular (clinchers). In a previous post, I compared Copydex glue with SeamGrip. Both work, but Copydex peels after a while and the SeamGrip is really gloopy and messy to apply. Water based SeamSure is way easier to apply:

It's a milky solution that is dead easy to brush on to the sidewalls of the tyres. Another easy way is to smear it on with gloved finger. A bonus is that you can wash up with warm water and soap. It actually comes in a bottle with an integrated brush, but I didn't bother with that, and instead used a better quality half inch wide paintbrush.

According to the package literature:
"Seam Sure is a fast drying water based urethane formula designed for sealing sewn seams on synthetic fabrics and breathable laminates. Seam Sure dries to a clear, flexible, long lasting film with a nearly invisible, non-gloss finish. Seam Sure is washable, dry-cleanable and freeze/thaw stable". 
Now doesn't that sound perfect for CX tyres?

Amazingly easy to apply and it does indeed dry almost invisible, with a matt finish. The only question then is how will it survive the cyclocross season? I will find out over the next months and let you know.