Depictions of greed, avarice, lust, sloth and pride have been uncovered in a £140,000, three-year project at St Cadoc's Church, Llancarfan.
An event on Friday will celebrate the rediscovery of the 15th Century wall paintings last seen in full in 1547.
Funding is being sought to uncover the two remaining sins - anger and envy.
Parishioners set up a conservation committee in 2008 when architects discovered a thin red line of ochre beneath more than 20 layers of limewash added over five centuries.
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