I have a 18' pro jet tracker with a pretty big dent in the hull just before the intake. My question is: Does this boat have a double hull, and if I drill a hole in the dent to pull it out how easy will it be to weld the hole shut? There are 2 cracks 1 on either side of the intake that need welded and I'm afraid that I might catch foam on fire if it is double hulled.