So I've been sitting on an unused internal coolant seal. I'm willing to cut it up for the prospect of science and the rotary community at large. Here's what I propose:

I get samples of various coolant mixtures and other fluids and submerge them for a period of time to see how the seal holds up.

I do not have a means of pressure or heat cycling them so I may have to remove that from the equation and only identify issues with fluids that can cause 'static' damage to the seals.

I remember when DEXCOOL first came out and was recommended for European aluminum engines. Soon afterwords many American manufactures started using it. Some paranoid people said it ruined their seals and engines soon after switching to it.

As we know, all sort of things can happen and then one draws the wrong conclusion without scientific testing.

Since "I" rebuilt my engine in 1999 to racing specs and dynamically balanced, it has used:
(1) 75% distilled water, 25% Dexcool, and 1 bottle of Water Wetter.
(2) Royal Purple 5-30 oil.

My engine has over 40,000 miles at above 350 whp.
Last year when I checked the compression, all faces were above 115psi. The engine still runs great and never had any coolant leaks or oil problems.

Maybe building an engine properly is more important?

not that Rotary Performance is the gospel - but Chris Ott recommends using Redline Water Wetter here in TX to help combat the heat.