Antigua 215sb Roof Repair...updated

See photo below on a foam vs. adhesive issue. I used DAP Weldwood Contact cement to adhere the new FRP top deck layer to the existing deck layer. 95% of the existing deck layer was the factory Luan and a couple small areas were exposed "styrofoam". I had read in multilple forums that this contact cement would not dissolve the foam. Thats not entirely true in my actual field application. When rolled on in a thin layer, it appears to hold to the foam, but because that condition is now fully concealed I cannot say for sure. In this photo I had a small 3/4 inch gap where my new deck FRP didnt quite span the gap I made. So during the preparation to install the EPDM, I poured this gap which was 1/2 inch deep full with contact cement and it ate right through the foam. I quickly scraped the remaining cement out of the void and let the rest dry. The fix was I filled it with "gaps and cracks" aerosol foam which expands a little (but not 4X). I let it cure and swell, about an hour, cut it flush with the top deck and we overlapped this seam with Seam Tape and then EPDM.
So the lesson is dont lay the contact cement on too heavy in foam or insulation!