Yes.
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Use a roller or staining pad to apply the oil or water-based semi-transparent stain. Go in the direction of the grain and do not allow the stain to puddle.
the deck or porch will become darker and darker after every stain u put on
You can use a sponge applicator on a broom handle or extension
You should check the label on the specific product you're planning to use. If the label states it will adhere to wood with an existing coating, then it's fine to use even over an oil-based stain. (This is because once thoroughly dried, oil-based stains behave the same as water-based stains.) Some products, however, will require the existing stain to be stripped from the wood, or to apply a primer coat over the existing finish before applying new stain.
By testing it with denatured alcohol. If the paint comes off on a rag soaked with the alcohol, then it is water based, If not, oil.