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That was me that painted the ellipsoidals. I used a primer coat first, but I don't know that you need to do that, since the base you have is different than mine (mine was flaking off due to age and neglect, plus there was paint all over them).

However, you've got different problems in that some TB case parts are plastic and some are metal, IIRC. Removing all the case parts is difficult, since the guts are attached to the case in some places. I'm guessing this is going to be a very time consuming project and it may not be worth it.

If I were you, I'd try and sell these and replace them with what you want. The new Strong product is fine if you want a straight replacement and I'm sure you can find something comparable in the used market. There is a market for white fixtures, especially in churches and people who work in tents a lot. I might be interested, if I had the $$$ right now, except I don't.