well my 2003 Disco is now minus my headliner... A pillar leak and can hear air loud coming through.. ive tried to seal a few areas and its helping but will do more... question is... all that void space unused up in that area.. could one use expanding waterproof urethane foam to seal that up? seems a little in there were we cant see cant harm anything... my headliner isnt super solid like I see on all the videos so i may add a little support areas of fiberglass on the top.. not much just my front half wanted to fold over...

 

I don't think that foam would be water tight. I have used flexseal FlexShot on A pillars and Sunroofs and it works pretty good.

https://flexsealproducts.com/products/flex-shot

 

Ill check that out

 

I wouldn’t add any weight to the headliner. Fiberglass can get heavy quickly. It would be better to just look for one at a salvage yard

 

yeah maybe ill look there.. however it would only be very very lite on the side just so it doesn't try something funny.. nothing on the top.. i really am considering a sunroof but only the skylight ones that dont leak not the contraption landy made that requires more repairs later lol

 

Definite no to expanding foam. It will cause water issues / get wet / rust the metal if in fact water's getting in there.

 

ok thanks... this may be a windshield removal situation lol its annoying to get soaking wet on rains when not intending too lol

 

Contractor here. Expanding foam is not a solution for water stoppage. In fact, it'll just accelerate corrosion since it really won't ever dry out fully once it gets wet.