What can you recommend based on experience for a good sun tan lotion that won't stop the tan or ruin your skin? I've been using SPF8 on everything except my nose and cheeks which get a 30 and/or 15. Waterproofness is a must with my daily on-the-water routine. I heard that sun block goes bad after a year - is this true? Some clog pores, some don't ---- soooo many choices ---- help.