How can I make old countertop look good
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there are countertop restoration kits from Gianni and Rustoleum
contact paper. It's changed so much since the old days.
I would take a look at some of these. If you want to go "creative" cover them with pennies or something creative.
https://www.google.com/search?q=making+old+countertops+look+new&rlz=1C1BLWB_enUS700US700&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjBjL6Xje7WAhUJziYKHRM7BocQ_AUIDCgD&biw=1138&bih=794&dpr=1.13
We did a skim coat here: https://alifeunfolding.com/how-to-diy-a-concrete-bar-top-in-a-weekend/