Years ago I had a serious fall due to slipping on the bolts. Since then I have used "3M Safety Walk tape" in a 1-inch width along the entire length of the strips and have placed strips of the same material over the rows of beam bolts (I also cover the smooth fiberglass between them). It is very durable and has held up well over time.
It is available in white, and here in the US you can buy a roll or by the foot in most hardware stores. It's also easy to find sources online.
The following link shows a photo of my forward crossbeam base. Notice I also put the 3M tape on the trailing edge where there is no non-skid. That's where you need it.

This photo shows the non-skid on the aluminum strip that attaches the net. The zig-zag sewing is Gore-Rex thread (Tenara) overstiching, which is resistent to UV:
