I need to underseal the arches on my new car, and ill probably underseal underneath while im on a roll and covered in the stuff.
The arches are starting to lose their original underseal you see.
What is the best method for removing the old stuff?
And what is recommended to use, I would prefer none super sticky stuff, so I can jetwash down the underside of the car and the arches to be left with lovely shiny clean arches to show off
I have a tin of hammerite with waxoyl but its super sticky and messy and needs warming up before it even comes out the tin!
The arches are starting to lose their original underseal you see.
What is the best method for removing the old stuff?
And what is recommended to use, I would prefer none super sticky stuff, so I can jetwash down the underside of the car and the arches to be left with lovely shiny clean arches to show off

I have a tin of hammerite with waxoyl but its super sticky and messy and needs warming up before it even comes out the tin!