MX-5 NA – Water in the footroom

Hello together, after my last NA suffered a crack in the cylinder head due to overheating and I sold it to a mechanic, I decided to buy another MX-5 after finishing my training in almost 2 years. Of course, that didn’t work out. I just couldn’t wait. So I now have a MX-5 NA at home again, which is not driving. Only this time I learned to do this and did not sell my everyday car and am The Mazda is 1990 and first-hand and has run just under 150,000Km. For 10 years he has been logged out and the last year of it he was unfortunately outside. That the soft-tops are not 100% dense I noticed already with my previous NA, however with this now the footroom is damp. Normally even despite a only 99% dense vinyl-daches should not collect the water in the interior, right? My plan is, the Mazd next year for his 30th birthday to be presented to the TÜV and an expert for an H-mark and to be able to move from then on beautiful days. He will hopefully meet the technical requirements until then, but I would also like to have removed things like the damp footroom and hope that someone can tell me where the cause lies. I would be very grateful for any help!