Let me start by saying that I am glad we used fiberglass on the holes. However it sucks! Working with fiberglass is not my favorite thing to do but it sure works great. The outcome is exactly what I wanted 100% waterproof seal that is super strong. I know that a lot of people use eterna bond tape and I did think about using that but wanted to make sure there would be no issues. I think it was like $70 bucks i spent to get all of the fiberglass materials and was money well spent in my book. I would definitely do fiberglass again if I convert another school bus.
School Bus Conversion Videos