Wattyl Estapol Interior Polyurethane - Spray Can in Matt - Dry or Wet and Dry Sandpap

Hi

as per the Title i have used Wattyl Estapol Interior Polyurethane in a spray can, matt on a Oak shelf.

2nd Coat Prep:

I have to do the second coat tonight after 8 hours. Should I use 400 grit dry or 400 grit wet and dry? (ill do it by hand with a sanding block)

Also, when you wipe the sanding dust off, is it wise to moisten the cloth with mineral turps?

3rd Coat Prep:

do you recommend a 3rd coat? i feel the spraying leaves such a thin coating. If so, is it the same as for the 2nd coat prep?

thanks



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Wattyl Estapol Interior Polyurethane - Spray Can in Matt - Dry or Wet and Dry Sandpap