Hey guys, Im getting ready to paint my girlfriends 2005 honda accord rear plastic bumper I have used a high build primer and sanded with 400. I purchased some dupont chromabase satin silver and some chroma clear. I have never used this. the guy at the supply store told me I don't need to sand the base before shooting the clear? Is this true? also the directions say to flash basecoat 15-30 minutes before clearing. What is flash? Sorry for all the questions but I don't want to waste any material, cant afford to buy more.