My personal feeling is that these products should be used for rust *prevention* only, not for repair.

However, for a beater kind of older car then they are fine and useful to keep an otherwise useful car on the road and in service, just realize that you should by no means use these + fiberglass on structural elements.

I personally have never used them, but am considering having POR15 sprayed on the bottom of a car that I have at my restorer's now. Have not heard much about Miracle paint, can only imagine that it is similar to POR15. I keep seeing it all over that **************.com website, which is a decent place for parts and manuals in general.

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PagodaLOVER
1967 230SL, manual
1959 180D, manual