Use a high sun factor from one of the companies that specialise in the field. They have a background and will have the best products for the job. Tattoos will fade in sunlight especially red, blue, yellow. I have experienced this first hand when I did not apply my sun screen over the years. My multi coloured tattoo went from vibrant reds yellow and blues to just outline and the green ink all other colours were gone! I began getting inked again a few years ago and this time round I use high factor sun block on all my ink and hopefully they will now stay as vibrant as when first done, well I hope they do lol ๐