If you use standard contact cement, like Weldbond, the work time is usually not an issue. Once both parts are dry to the touch, they are ready to be bonded. There is no "work time" after bonding. You have to be right on the money. I don't think I would use this to glue my camper back together. I have used construction adhesives to replace lauan beneath the Fiberglas on mine with, so far, decent results. However, clamping can be a very creative exercise.
Good luck.
Did a search for Filon on google. First site has info on Filon install using Stabond contact cement. Might be of help to you.
Kip
2015 Skyline Dart 214RB
2018 Silverado Double Cab 4x4
Andersen Hitch