Does anyone know of a product that will help with making a saddle more grippy? Because my mares saddle is really slippery.

Gel pads
If you ride in tall boots, I think the Effol grip stick might help you out. I ride many different horses, so if one of them has a slick saddle, I rub some on the inside of my boots and I find it gives me just enough grip. I really like the Effol grip stick even though it's a little pricey for the amount you get, but it does last pretty long. Hope that helps, even though it isn't exactly what you asked for :)
Stubben saddle soap
Kavelerie gell pads work really well. (Sorry if I spelled it wrong)
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