OK, thanks for the explanation. I will keep a separate batch of developer without hardener for my normal prints.
Originally Posted by Photo Engineer
In terms of drying the paper, I've resorted to my watercolor tape drying method for fiber based prints, for keeping the paper flat. This means I will first soak the paper, than attach it to a glass plate and fasten it with watercolor tape. After drying, the paper can be safely coated without bulging due to the tensioning in the paper.
The Hahnemuehle acrylic paper worked well for printing. I have some first print results ready now and I am very pleased with the overall look of the print and the feel and structure of the paper. Still some minor issues with even coating though, I have some more training to do.