I have used the SSRs in the daytime with great results but as mentioned above the heat will kill you sometimes. If you are working in direct sunlight you will find that they break down faster & dust...
I topped it with UPP and had no issues...it was slick as all get out. Being obsessive I had to top that with Pinnacle Paste Glaz which was awesome. Folks said they'd never seen a Diamond Graphite G...
You can put EX-P on with your PC & pad as others have suggested. It plays well with Naty's original and blue. The Blue seems to mute the flake a bit but gives you better depth than the original.
I'm sure heat would help but with this sort of striping but I'm not sure how well fishing line or dental floss would work. Fishing line tends not to break apart as easily as floss and is a better...