This thread hit a nerve with me. About three weeks ago I gave up putting air in one of my 4430 front aircraft tires (we have a few thorns in So. Texas) every time I used the tractor. The tire would not seal to the rim. I took the wheel to the local tire shop and told them to put a tube in it. He did not have the tube and told me he could have it the next day. No problem, I'll pick it up in two days. So I picked it up paid him $60 and put it back on the tractor. Next day it was flat. Went back to airing it up every day. Thought about driving to Wharton (about 2 hour drive each way) and buying a new tire. But on Thursday the tire was flat again and had separated from the rim. There was no tube in the tire, just Slime. #%&#@$$!!! Not wanting to drive to Wharton, I decided to try to seal the tire to the rim myself. After two tries and a LOT of bead sealer, it appears to be holding.