hi I recently finished restoring 1936 Desoto Airstream s1.Although it came out spectacular i made a huge mistake in not filling the seam on roof with body filler thinking i could get a roof seam gasket .I used a t shaped windshield gasket and siliconed it in place. It looks great however it leaks.I would like to get the correct gasket if anyone knows where, that would be awesome.Can anyone tell me if originally the seam was lead filled by Chysler .OR was there a gasket . If i cannot find gasket I will have to refinish most of the body. very costly and much labor thank for your help