..carboard molds. They quit using the carboard 25 years ago...I pulled a lot wet cardboard out of the holes. One of the layup guys suggested I plug holes but for a small one, do the soapy water thing by pressurizing the chambers, look for bubbles.

Instead I'll be epoxy sealing the tops perhaps adding a layer of light cloth and fairing in .....someday when the sun shines and I got a good rhythm. Had that last about August of last year..... In the interim, I got sponge and holes, eh!