Got my first block paving sealing job tomorrow (weather permitting)! I have a Gloria 510T sprayer with a needle nozzle and will be using Sealers Direct Premium Ultra HD sealer which I think is acrylic based. Any tips for my first job? I have some sealant cleaner so how do I clean the sprayer afterwards? Could I use the same sprayer for weed killer, mould killer etc or would you use a different sprayer (gets expensive)?