Morris Minor Owners Club

For best results the door 'skin' needs to be covered, although this can be awkward especially if they have been flooded with waxoyle or the like. We found that treating the bulkhead reduces noise considerably, wheel arches and floor reduces drumming, the doors make quite a difference along with the side panels and under the rear seat, then you are left with the roof, which makes a massive difference, but is by its nature probably the most involved.
A few companies sell cans of sound deadening foam which can be built up to 4mm thick and works in difficult areas to cover like the underside of the dash and bulkhead, inside the boxed section under the rear seats.
Its worth noting that a good wipe down with panel wipe will help the adhesive sheets stick much better.

I can't understand

side panels under the rear seat

Surely there is only floorpan under the rear seat?
Happily my Minor is reasonably quiet, probably due some very thick under felt but I intend to replace the manky felt behind the dash and do something about the bonnet.
I like the sound of a nice solid thunk when closing the doors so that is on the cards now.

MarkyB wrote:Surely there is only floorpan under the rear seat?

Yeah, that JLH, you can't trust a word he says, can you...



PS Take the seat out and have a look sometime, you might be surprised
a

side panels under the rear seat

He said

side panels and under the rear seat

which makes perfect sense to me.