How can I refinish badly stained Formica countertops?
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tops are at least 30 years old; stained ad have major gouge as big as a quarter in it
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they have a product that you can use. Lowes
You might just consider replacing them as the cost of repairing or refinishing ones in such dire condition may be more costly.
Rustoleum makes kits for painting formica countertops too
The kits from Rust-o-leum or Giani work well. Also a good primer and a good paint will work as well. I read also from a women who used 2x10 boards as a counter and polyed them to last.
Before you refinish them, fill in the holes with laminate repair paste. Here's some directions on how: https://www.hunker.com/12351007/how-to-repair-a-hole-in-formica
https://www.diynetwork.com/how-to/rooms-and-spaces/kitchen/how-to-repair-and-refinish-laminate-countertops
I did both mine and my friends countertops with 2 coats of black hammered hammerite paint they turned out great but you need to be very careful with them for about a month till the paint cures I bought a pack of cheap table mats to protect it once cured it is very durable make sure all doors and windows are open and wear a mask good luck