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The problem with using 511 first, is nothing else will bond to it.
I think Ole' is water/acrylic based, while 511 is solvent based.
You should acid wash/strip the whole installation. Let it dry for at least three days, then apply a new sealer.
The biggest problem with the exterior applications is they do not look very good for very long if you want the more attractive high gloss finish.
I suggest you do a test area first to be sure you like the results.
If a natural finish is OK, just use several coats of 511 or Porous Plus.
Check with 'Miracle' sealers, as they may have a high gloss solvent based penetrating sealer that would compatible with 511 or used stand alone.
KT
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'74 914-6 2.6 SS #746
'01 Boxster
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