small camper with PMF - water issue

[sophia0606]

Hi,

I've built a small camper with foam for roof and plywood for siding. I choose PMF (canvas with Titebond glue) for the waterproof solution. Last week, we have a very heavy rain and I noticed there is some water leaking on the side part. What can I add over PMF to prevent any more leaking? Any suggestion would be greatly appreciated.

Thanks

[Pmullen503]

Another coat or two of latex paint if the water was coming through the canvas.