I've decided to make my DH this tomorrow since he's never had it nor does he even know it exists but he loves ice cream sandwiches and I figure with all that's going on with my MIL he's not really in the mood to celebrate his birthday. We do have a rather large birthday cake in the freezer now due to the cancellation this weekend but just had cake last week twice for 2 parties for my DS and we'll be having more next week for my bday. My question is...I'd like to actually write HBday on the cake but don't know if this is possible due to the whipped topping. Could I spread it smooth on top, refreeze it for a bit and then pull it out and write on it? Would the whipped topping have hardened a little, enough to write on it or should I just forget it and get a HB candle instead?