Thanks all!
And to address the do I need it after 2 years.... Possibly not. But if I see something that even resembles a crack I touch it up. Along the front seam it seemed to be showing signs of some hairline cracks so I just ran a new bead across. Seems like there is always a small spot here or there that looks like it might start cracking so I have just been adding from time to time. I probably overuse it which is what prompted my question. I had serious water damage in a previous camper and it destroyed the camper so I am a bit over cautious I suppose.