camper top

my dad and i built a camper, not a teardrop but i got motivated by looking at all the trailers. for the roof we used the white paneling you use for around a bathtub.
i do not have many powertools and did not have a way to bend metal for a roof. I took the trailer to a linex dealer and he sprayed the roof for me. it worked for about a month, we have had a couple heavy rains and i have leak in the roof where the panels met.
the linex works great, nothing sticks to it. any one have any ideas. the trailer resembles a canned ham trailer,very flat on top curvy on the corners. I need to get something to stick to the top.
i do not have many powertools and did not have a way to bend metal for a roof. I took the trailer to a linex dealer and he sprayed the roof for me. it worked for about a month, we have had a couple heavy rains and i have leak in the roof where the panels met.
the linex works great, nothing sticks to it. any one have any ideas. the trailer resembles a canned ham trailer,very flat on top curvy on the corners. I need to get something to stick to the top.