FYI I successfully sealed the evaporator leak on my 92 300D with Cryoseal (a high-end sealant). I did a lot of research on the stuff http://www.cryochem.com/r134a.php. From what I understand, evaporator replacement is a solid 16 hours of labor...just couldn't see spending that kind of money.

Now I've got a leaking compressor (Cryoseal does nothing for compressor shaft seals), so I'll need to replace at some point.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife