Never used RTV Silicone/silicon sealant in a waterblock (only been making them for a month) but maybe the reason some people dont have much luck is the lack of silicone in acrylic? as rtv silicone sticks best to items with silicone in them (or hard objects) acrylic is slightly "Oily". As an experiment try gluing an item to Al and another to Glass and see how hard it is to get the silicone off the Glass!. Another observation i've made with it is the difficulty in getting rtv off piston heads in engines (High silicone content)... My 0.2c Keep up the good work :beer:
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