1. Rondo may actually take many days to cure. It may remain tacky inside a helmet for a day or more. Check daily for tackyness. Keep the helmet in a dry, warm place. Eventually the tackyness will go away and the outgassing will stop as well once it's fully cured.
2. Rondo's messy and drippy and runny. Create a dam from blue painter's tape to form a lip that will allow you to run the Rondo up to the very edge of your helmet opening and build up thickness at that point as well.
3. Work in the warm sunlight. Sloshing around in the sun allows you to really see where your Rondo's going AND the additional heat from the sunlight helps set it even faster. Setting the helm down in the bright sun really helps radiant heat from SOL warm the helmet and (I'm guessing) speed the curing process. You can also use the bright sunlight to see through your Rondo from the inside, so you can move the Rondo to the areas that don't have as thick of a coat on them.
2. Rondo's messy and drippy and runny. Create a dam from blue painter's tape to form a lip that will allow you to run the Rondo up to the very edge of your helmet opening and build up thickness at that point as well.
3. Work in the warm sunlight. Sloshing around in the sun allows you to really see where your Rondo's going AND the additional heat from the sunlight helps set it even faster. Setting the helm down in the bright sun really helps radiant heat from SOL warm the helmet and (I'm guessing) speed the curing process. You can also use the bright sunlight to see through your Rondo from the inside, so you can move the Rondo to the areas that don't have as thick of a coat on them.