Process of manufacturing auto bumpers

A process for forming an auto bumper comprising:

• forming an outer visible part comprising a stainless steel plate having a first thickness;
• forming a layer of one from the group consisting of aluminum and aluminum alloy bonded to one side surface of said plate, said layer being bonded to said plate by frictional deposition on substantially said entire one side surface, said layer having a second thickness smaller than said first thickness;
• and
• forming an inner part comprising a fiber reinforced plastic material bonded to said layer by heating and pressurizing said fiber reinforced plastic material to directly adhesively bond said layer to said fiber reinforced plastic material,
• whereby said layer is sandwiched between and bonds said inner and outer parts to form a unitary bumper having low mass and high lustre.