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you can either remove the humidity....hard with a screened space. Or warm the slab / insulate it which is also hard.
Being a screened porch this structure should be somewhat water resistant by its design...so
My stained garage floor occasionally does the same.
Heard of Astroturf?
It may have to do with the visquine, I don't know.
If you want a lower cost alternative to the slippery. A textured paint 'anti-skid" finish can be applied. The concrete will still cause some condensation to form but at least the "traction"will still be there.
A built up "insulated floor" is another option, but this would require some engineering to keep horizontal rain from compromising the new surface.
A wooden "deck" could be installed over the concrete on thin PT sleepers. This would have the condensation still form on the concrete but the wooden surface above would still be dry and usable. The decking would be "weather proof". This decking could be real wood or one of the many synthetics.