Ok...so if I get 2 decent days in the next couple of weeks I'm going to try applying my own coat of silicone to some uncoated ripstop nylon "Yes, but - why????..." Let's say I have my reasons which I'll explain at some later point. I'm sharing this piece of whimsy in the hope of some collective advice/alternatives and also for some general jollity at my expense The proposed Modus Operandi: Take one 90% finished myog hexagonal tarp made of uncoated ripstop before any mid panel tie-outs/lifters are added. Any reinforcements I will have added at this stage will use already coated material. Pitch the tarp outside where it'll get the glorious UK August sun for most of the day. Plan is to apply the equivalent of 0.2oz of silicone per square yard, half on one side, half the other. The tarp will be 6.5sqm so that's 22g of silicone each side according to my maths. Weigh out 22g of silicone into plastic container with lid. Add (by volume) ~30 times that quantity of low odour White Spirit. Stir then seal with Clingfilm put on the lid and shake thoroughly to mix. Apply to tarp using a cheap foam brush. I'm expecting this stage to be pretty darn quick and I'll make an eyeball judgement after the first couple of long brush strokes if a 30:1 by volume mix is going to give a good, even coverage. Leave to dry outside for 8 hours plus, then hang the material in garage for 10 days to cure. On the next available decent day, repeat above but for the other side on the fabric. Complete build and enjoy results (in my dreams.....) The alternative is to apply silicone to the raw material before cutting and assembly but I'm using a simple pattern and I'm reasonably confident in the outcome so I'm going 'all-in' and just coating the fabric I use. All the above sounds protracted but I reckon the mixing and application of the silicone mix will take < 30 minutes. Has anybody done this before and/or got any wise words to pass on?