My church interior is being painted soon; I want to liven the acoustics. Is there a special paint?

The sanctuary is fairly large, and has a moderate echo already. I am worried that the new paint will deaden the reverb, and am trying to find a paint that will keep the surface as hard as possible (even if it means repainting a coat on top of the pigment coat.)

The church uses traditional music, choir and organ, and so would favor a live acoustic.

Does this paint exist? I've heard about it being used, but I don't know if it's just rumors. Where can I find it?

Answers:
Oil paints dry to a harder surface than latex...

Glossy finishes are smoother than flatter finishes

Other answers:
There is something out there called Acousti-coat, but it's meant to reduce an acoustic effect. Check out Where in columbia south carolina can i get some free living room furniture for my friend?
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