Well OK more like sponge...

Athearn packs their HO locomotives in a dark grey sponge material. This material can be used in some pretty interesting ways. Most of us disguard the stuff with the box, unless you keep the box, that's another story. Here are some of the ways I've used this stuff.
* I have used a piece of the sponge as a part holder for painting things like grab irons, lift bars or anything that you could stick into the sponge to hold it while you paint.
** I have cut off small squares of the sponge, (about 1/4 x 1/4) and mounted toothpick handles on them for use as paint brushes for water based paint, chalk applicators, wheel tread cleaners, (have used RailZip and alcohaul with no adverse effect).
*** Have created N scale hopper car loads, cut sponge to fit car, paint with water based paint and stick fine material to wet paint. Load is removable and cheap!!
**** Have used a long piece of sponge as a paint handle for N scale freightcars and locomotive shells. For HO I glued a 2" strip of the sponge around a paper towel cardboard tube, which you can squish down to fit in a loco or freightcar shell.
2slim :thumb: