Painting a back porch.

Michael Harlan asked 5 years ago

I am painting a 100 year old back porch which has lots of old layers. The last coat was a water based coat put over a previous oil based coat and is obviously chipping and coming up. I am sanding it now. My question is do I need to take all the water based paint off or just rough it up. Also what grit paper is the best to use?

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