RTV Silicone failed me again!

[siavash_s_s]

make a thin neoprene gasket that functions like an o ring, but is not covering the whole plate.. that way it will still look sexy and also b 100% waterproof... this is my plan for my future? #rotors

[zer0signal667]

Originally Posted by kipperfillets

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:

You may have a point to some extent, obviously silicone sealant will bond more readily with some materials. But I think the surface condition is what's more important. Glass is usually very smooth, so it won't bond well. Metals often aren't so smooth, especially the rough cast pieces that are usually sealed with RTV in automotive applications.
And just for future reference, there is no silicone in cylinder heads or any other metal object for that matter. There is silicon, but there is a large difference between that and silicone. And most glasses that you'll run across are mainly composed of silica (SiO2), another silicon-based material.