[1] Mortal Sin spent much of 1988 recording a second album, Face of Despair, with United States producer Randy Burns (Kreator, Dark Angel and Megadeth).

"[2] Australian musicologist, Ian McFarlane, noticed that "With its greater attention to song arrangements and quality production, the album vindicated the overseas interest shown in the band.

"[1] The Metal Forge's Simon Milburn rated "Face of Despair" as 8 stars out of 10 and explained that it was "the pinnacle of their short lived thrash career...

The new line-up found some acceptance, however by the end of the year Hughes, Burke & Carwana had all left the band due to past management and touring issues, to pursue other interests.

Eftichiou and Sly continued rebuilding the band, recruiting Alex Hardy (guitar), ex-Enticer guitarist Dave DeFrancesco & drummer Nash Hall (the Wrecking Crue[Parramatta]) and toured for 12 months.

After supporting Megadeth on the Rust in Peace tour of Australia, Mortal Sin were faced by more problems, including venue issues, split with their management and internal bickering.

Mick Burke moved into the area of sound engineering and was later involved in a motor vehicle accident that left him with a permanent brain injury.

Scerri had played in a long list of bands throughout the late 80s and early 90s, including White Trash (with Campbell), Death Mission and This Thing.

Troy Scerri moved on to various heavy rock, hardcore and stoner bands that have included Daredevil, Faturra Della Morte, The Blasting Process and The Neptune Power Federation.

In February 2004, Mortal Sin once again reformed, this time as Campbell, Maurer, Eftichou and former Addictive guitarists Joe Buttigieg and Mick Sultana.

In August 2006, the band returned to Europe where they appeared alongside Michael Schenker Group, Rose Tattoo, Metal Church, and Tourettes Syndrome and performed at the Wacken Open Air Festival.

Mortal Sin's fourth album An Absence of Faith was recorded in February 2007 at The Basement Studios in Sydney with producer Phil McKellar.

Back in Australia, they supported Judas Priest and Testament in 2008 and late in 2009 undertook a two-week tour of South America, for which Mick Sultana was temporarily replaced by Andrew Lilley.

In 2011 Ryan Huthnance replaced Sultana ahead of an Australian tour with Overkill and in July Mortal Sin finished recording a new album, Psychology of Death.

[6] Vocalist Mat Maurer talked about the hardships Mortal Sin had to endure as an Australian metal band separated from the rest of the world in the 1980s, and the welcome responses they received by a younger generation when touring Europe in the 2000s.