I have read here and elsewhere that Krylon Fusion for Plastics (once fully cured) can be a safe sealant for DIY tank decor. I have a project in mind so I went to the paint store to get some. In talking about what I wanted to do the store person said they thought it would not be safe for a tank because of the solvents in the paint. I forgot to mention the point of letting the paint fully cure in the store. Is that the basis of the different opinions here?