Mars played guitar on the title track of Hinder's 2008 album Take It to the Limit, and contributed a guitar solo to the song "Into the Light" by Papa Roach, on their 2009 album Metamorphosis. Mars also contributed a guitar solo to the song "The Question" on Rock Star: Supernova runner-up Dilana's U.S. debut album Inside Out. In 2010 he co-wrote a song with Escape the Fate for the band's self-titled album, which was instead withheld from the album and reserved for a later release. Mars co-wrote and appears in the music video of the song "Boss's Daughter" by Pop Evil on their 2011 album War of Angels.
Mick Mars in his early career used guitars that were popular at the time: Kramer, and other Superstrats; on occasion he used a black Gibson Les Paul, and sometimes a B.C. Rich. However, according to an interview published in September 2009, Mars' main stage guitars for that tour were Fender Stratocasters with an "HSH" (humbucker, single coil, humbucker) configuration. He frequently used a Stratocaster modified from components of 1963, 1964, and 1965 models with J.M. Rolph pickups and a licensed Floyd Rose bridge system turning it in to a Superstrat.