I tried Armor-all and it just did not do anything other than remove dirt. the plastic looked dried out still. I remembered that your solution had oil and cleaners so I decided to try it on a small part (seat hinge cover) and it was amazing. I have since done all of the plastic on the 65 Vair and it is SO much better. I am going to try it tonight on the old seat belts... The folks on the corvair site were very interested, so I shared the formula (as per your previous OK) THANK YOU