I had hijacked the DECAL Tread to ask this question but I just thought I would start a new one. BCB Puma wrote: Windex works well. Apply windex to boat surface, apply sticker, work excess soap out from under sticker. Wait awhile and carefully remove backing. What about others is this what you are using to install on the hull, I would think the ammonia in the Windex would attack the decal adhesive