They work for me. I just finished using them for about an hour at 70 degrees F, 32% relative humidity indoors in winter and I didn't have any problems with drying. All I did was keep the pen as close to vertical as possible and pump whenever it gets scratchy.
Rating: [5 of 5 Stars!] 1 of 1 found this review helpful - did you?
[5 of 5 Stars!]