Timber Decking Non-Slip Solution

Hello All

I own an apartment which has 6 timber walkways on different levels connecting two building. At present there is timber decking which gets very slippy when wet.

I have heard that a possible low cost solution to prevent slipping is painting a non-slip paint onto the decking and sprinkle some coarse sand/grit onto this.

Has anyone any experience of doing this - does it work - is it a long-term solution?

Thanks in advance