Sorry to hear about this, Airush would like to take care of your issue no problem at all.
If you haven't done already - please bring this back to your Airush retailer. If you have without hearing back, you can contact Airush Customer Service directly at Customerservices(at)airush.com and Reza will get back to you within 24-48 hours (or less). Please PM me your email just incase.
Airush uses a 0.5mm topsheet, the thickest in the range without making the board super heavy.
Hope Airush can fix your problem ASAP without losing any valuable time on the water.
Marc Schmid @ Airush International