Not needing explicit support from Scripture is one thing, asserting that purgatory is derived from it based on the premise of required perfection and ambiguous texts, is another (see .
But as your real basis is the authority of Rome, as a RC must hold that the Roman church is the final authority on Truth, rather than Scripture (as man's reasoning is fallible), would tell me upon what your basis is for your assurance that Rome is the one true church rests.
Purgatory has ample Scriptural support as Salvation pointed out in Post #20. If you had a complete Bible you might have known that.
Peace be with you