bert baker Posted February 1, 2017 Share Posted February 1, 2017 iHi to all I have been doing a little tissue and dope model for free flight I thought it would be a good idea to set the cooker on to 80 and bake the paint I thought the paint was going to flow better but it looks boiled Quote Link to comment Share on other sites More sharing options...
Kim Taylor Posted February 1, 2017 Share Posted February 1, 2017 Hi Bert, Looks like solvent 'pop' to me. What's happened is that the surface has 'dried' before all of the solvent has found it's way out. This causes the gassing solvent to pop through the crust, so you get these blisters. Rub down & repaint, or strip it off and go again. Warming it up is one thing, but 80 degrees obviously too much of a good thing. When I'm heating 2k laquer to speed the cure up, I try not to go above 60 C but my gut is telling me that anything over 20 to 25 would be too much for a cellulose based paint. Kim Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 1, 2017 Share Posted February 1, 2017 A hot air gun would be better used Bert, as you can warm the area up and immediately remove the heat if problems occur. From school, my 1st job was in a stoving enamel factory, where items are dipped in paint, then hung dripping onto a conveyor through an industrial oven, and popping like this was apparent when heat control changed with the weather and the colour of the paint ! ! ! So the thinner mix was too involved, as well as the thickness due to colour pigment, in the drying process It is a science, and computer controlled these days, so you see Bert, you stood little chance of success without Test Pieces and Temperature Chart, a long process Quote Link to comment Share on other sites More sharing options...
kevin b Posted February 1, 2017 Share Posted February 1, 2017 The only models you can dry in an oven at anything above room temperature are metal ones. Plastic models melt and wood "breathes", so that as the paint dries, so does the wood and air trapped in it has to go somewhere. Usually out through the freshly applied paint ! Also you would be very lucky if it came out of the oven anywhere near straight. Heat and wood do not mix, unless you are using it for reshaping. Note : 80 degrees is the temperature we bake motor vehicles at when we repair them. Anything higher and you start to melt things, such as tyres !!! Edited By kevin b on 01/02/2017 21:46:43 Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 2, 2017 Author Share Posted February 2, 2017 Many thanks,for all your replys, I have flatted back,And second coat looks better Edited By bert baker on 02/02/2017 05:33:34 Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 2, 2017 Author Share Posted February 2, 2017 Quote Link to comment Share on other sites More sharing options...
onetenor Posted February 2, 2017 Share Posted February 2, 2017 WARM not Hot is the answer Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 2, 2017 Author Share Posted February 2, 2017 Getting there Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 3, 2017 Author Share Posted February 3, 2017 Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 3, 2017 Share Posted February 3, 2017 Very Smart Bert Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 3, 2017 Author Share Posted February 3, 2017 Thank you, I need to paint straight white lines, I have a draftsman pen in a compas set,not really sure how it works Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 3, 2017 Author Share Posted February 3, 2017 Found out it's called a ruleing pen, time to watch some videos . Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 3, 2017 Share Posted February 3, 2017 Look in your compass set Bert, there should be a ruler with a rebate on the bottom edge whereby any ink cannot act by capillary and flow under the edge, therefore leaving a clean line on the model. Masking tape the ruler down where it needs to be. Get the ink flowing from your mapping pen freely onto a flat waste page, then take a deep breath and go in one motion along your desired line. Test too that the ink will " take" to your paint, you are best degreasing the area with a quick wipe over with something like meths and not with oily turps. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 3, 2017 Share Posted February 3, 2017 Sorry Bert, I missed out White Lines. Yes, use paint, but thinned. You will have to test, but start at 3 paint to 1 thinner. See that it runs through the pen. You may know we use the consistency of milk for airbrushing, but this may be too thin. Experiment Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 3, 2017 Author Share Posted February 3, 2017 I have looked in box, alas no ruler-straight edge, could make one I suppose, many thanks for info Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 5, 2017 Author Share Posted February 5, 2017 Well after quit a few practice lines I still wasn't much cop at it so just got on and did oneside, it went a bit wide at start,aargh and ended up back filling with some red,and a bit of black aswell Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 5, 2017 Author Share Posted February 5, 2017 Quote Link to comment Share on other sites More sharing options...
bert baker Posted February 7, 2017 Author Share Posted February 7, 2017 I will be needing more practice Quote Link to comment Share on other sites More sharing options...
bert baker Posted August 23, 2017 Author Share Posted August 23, 2017 I have lost the plan for the weesnifter, I need to know the c/g any one got a plan of it please Quote Link to comment Share on other sites More sharing options...
kc Posted August 23, 2017 Share Posted August 23, 2017 The plan is online at Outerzone Quote Link to comment Share on other sites More sharing options...
bert baker Posted August 23, 2017 Author Share Posted August 23, 2017 Hi many thanks, I got this name wrong, it should have read wee snifternezer it is a profile fuz planes I found a pic of plan I took before build but it does not show the c/g Quote Link to comment Share on other sites More sharing options...
bert baker Posted August 30, 2017 Author Share Posted August 30, 2017 I took it to the Nationals, it needs more down thrust and more nose weight Quote Link to comment Share on other sites More sharing options...
bert baker Posted January 5, 2018 Author Share Posted January 5, 2018 Quote Link to comment Share on other sites More sharing options...
bert baker Posted January 5, 2018 Author Share Posted January 5, 2018 Finally got round to fitting a wire undercart and wheels. The engine has been sorted out,and now just needs a venu to go to. Quote Link to comment Share on other sites More sharing options...
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