need traction on a deck ramp

You could put some grooves or flutes across the ramp with a router and re-seal it. They wouldn't need to be that deep to improve traction.

On a ramp at work, we just put a coat of clean poly and spread some sandbox sand on it. Works, an really not visible.

I was going to say that! You beat me to it. It would look nice too. Only problem is it could be a place for water to sit. Maybe drill a 1/4" weep hole every couple of foot in the flute groove to ensure no water accumulates. Really it would depend on where you live and your climate. Many parts of the country that water would be gone in hours. Others it would sit for days.

That's an interesting idea. Have you had success with this, or do you know anyone who has? I'm looking for a solution that's been tried and has been successful.

-DT

It really depends on why you want a ramp, and your latitude. The grooves are an excellent idea, and I've had good results with the 3M adhesive grip strips, but if you intend to push a wheelchair up that ramp, and your climate is as snowy and icy as ours gets (Chicago), you're going to want cleats on that ramp. 1x2's slightly shorter than the wheel width of the chair wouldn't be excessive.

Don't cut horizontal grooves, cut chevrons, or a diamond pattern, like isometric graph paper.

They sell this stuff at HD or Lowe's that's like paint (in any color) with sand/texture built in. Spread that on. Works great. I used it on a wheelchair ramp I built for my mother-in-law's house. Gives decent traction. Some cleats may be good as well for icy/snowy weather.