Gentlemen: I have been watching the exchange regarding this question and I agree with Chuck about re-wetting the cups. In general, the densities of the catalyst and hardeners are close enough to consider them equal for the weighing measurements. If you weigh the parts in separate cups before you mix them together, the remaining coat of resin in the cup from which it is poured can throw off the mix ratio, especially in smaller amounts. Often I will pour the combined mix between mixing cups to ensure the ratio still remains the same. Personally, I agree with those who express the problem with partial pump strokes, and I have seen the problem when they are not correct. A postal scale works well, and is great for measuring other items, like parts, small planes etc. I would recommend that you get a scale with a plug in power supply as the use of 9V batteries can give problems if the scale current drain is high. Most scales will go to 60+ oz, which is nearly 2 kg, and represents nearly 2 liters (or 2 quarts) of epoxy. At this amount of epoxy the accuracy is close regardless of wetting. I use a postal scale for my micro HLG wings and fuses, with epoxy weights bewteen 15 and 25 grams total, and it works well. Chris http://www.scrollsander.com >I have used West Systems for years with the pumps, but I've always been >concerned about making 'partial stroke' batches. Weighing out the components >is the way to go, but does anyone know if the specific gravity for the >components are equal? That would make the 5 to 1 math easier. > >Martin Brungard >Tallahassee, FL > >"Meandering to a different drummer" > > >______________________________________________________ >Get Your Private, Free Email at http://www.hotmail.com > >RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
