Not so fast, Sealtech did not pick up a leaking window on my current RV. I found wet carpet just 2 weeks after they had done a leak test. The seal had gone bad. I now remove the internal screws along the bottom of my windows and the lowest side screw every year or so and gently pull back the frame. If there has been a leak, you will see it on the bottom of the frame opening. You have to be careful as those srcews go into the outer frame and hold it in place so you do not want to remove them across the top or sides and you want to disturb as little as possible.
Sealtech does not hurt, but do not assume it will reveal everything.
