[Silentalero]

use some stuff called tigerhair or kittyhair.

Pkus you need a backfiller simply becasue you want to reenforce the mold but you dont want it taking a bigger shape, build strength from behind and itll last u alot longer..

Tigerhair is what i used for my back seat molds, added quite a bit of weight to it to but its strong like a mofo