Hey Bill......
I think that a shop that specializes in gas r/c cars has some that comes in four "hot" colors (not all on the same roll)...neon green, neon pink, bright orange and purple...Buso would approve....
I've been using it for a couple of years (different colors for each function....I bought three one foot lengths.....it doesn't stiffen either...the shop where I bought it closed, but I think I saw some in another place the other day....