There are several reasons for this and in this video i tell you what they are.
Polyshades on floors.
However used simply as a vehicle for the stain to be applied or yes painted on top of an existing coating and then topped with a polyurethane that is recommended for floors polyshades is ideal.
Can polyshades be used on floors.
The use of tough polyurethane protects your floor firmly.
Minwax 61370444 polyshades oil based polyurethane for wood floors minwax 61370444 is an oil based poly that gives pure satin stain on your wood floor.
Maybe using a deck grade stain sealant will help but really can t say what it will do for looks of your floor.
Not sure how well it will hold up to foot traffic.
Minwax polyshades on my entire floor you could try to put a coat of polyurethane or two on top of the floor but as big g mentioned you re using it for a non recommended use.
Even it is usable at the door windows and wooden floors too.
Thin coats are easier to control than thick ones.
You are right on track by putting clear poly on top of the polyshades.
Polyshades is more like a paint in that the colour coats the surface instead of staining it and acts as the wear layer as well.
These two major materials make the polyshade more authentic and worthy.
Take care to apply an even coat of the product and remember.
Have a look at this affiliate link to see som.
The thinking of minwax is they cannot stand behind their product in flooring use since as the wear layer wears the colour density changes as well which to most users would be unacceptable.
Perhaps not ideal but likely at least acceptable.
The satin stain makes the floor smooth shiny and elegant.
Work quickly as you apply polyshades the length of each board in smooth even strokes.
The reason it wont hold up on the floor is that the stain that is mixed with the urethane makes the finish coat too soft.
I never use polyshades.
Instead stain with minwax wood finish and topcoat with minwax super fast drying polyurethane for floors or minwax fast drying polyurethane.