Wetting agent for sphagnum on small mounts?

[Another_World_Terraria]

I'm wondering if anyone has used a wetting agent for sphagnum. I have some small, mounted plants on sphagnum. My grow tent has constant air flow and heat, so the substrate dries out quickly. Some of the watering is done by an automatic misting system, and it doesn't soak in very well / runs off the mounts sometimes. I was thinking of trying a wetting agent so the sphagnum absorbs the mist better and stays wet a bit longer. Any thoughts or suggestions?

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