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      Stevej


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      Post #67104, posted on 04-30-2017 GMT-5 hours    
      I am building the AA B747SP resin kit. When I primed the wings using "Fine Surface Primer" there are areas where the primer just will not adhere and when dry there is no primer cover. Like oil on water. I had a very similar problem with some F-rsin engines and Laurent told be it was beause the resin did not cure properly and the engines had to be replaced. Anyone had this problem and any suggestion. I just sanded down the affected areas on the wing and re-primed and the same thing keeps happening.

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      Bill-ay


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      Post #67108, posted on 04-30-2017 GMT-5 hours    
      I had the same issue on my AA A300 wings. The wings were prepped before priming but maybe I'm just doing something wrong?

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      Stevej


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      Post #67110, posted on 04-30-2017 GMT-5 hours    
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      Bill-ay :
      I had the same issue on my AA A300 wings. The wings were prepped before priming but maybe I'm just doing something wrong?



      So what did you do?

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      Jennings


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      Post #67111, posted on 04-30-2017 GMT-5 hours    
      I find that styrene or wood advice works better than resin advice

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      cesare747


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      Post #67114, posted on 04-30-2017 GMT-5 hours    
      Guys,

      Never an issue priming AA kits, they just need a thorough cleaning.

      Get yourself a plastic tub, pour some good quality dish detergent over room temp water, soak the parts and use a clean 'scrubby brush' brush the parts several times while they soak in water, rinse and dry them completely.

      Hope that helps....

      All the best,
      Cesar
      MIA

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      BruinPrideBand


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      Post #67117, posted on 04-30-2017 GMT-5 hours    
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      cesare747 :
      Guys,

      Never an issue priming AA kits, they just need a thorough cleaning.

      Get yourself a plastic tub, pour some good quality dish detergent over room temp water, soak the parts and use a clean 'scrubby brush' brush the parts several times while they soak in water, rinse and dry them completely.

      Hope that helps....



      +1. The mold release agent will completely block the paint from reaching the surface. Clean the parts once. Then clean them again. Then again just in case.

      Chris

      "Sorry Goose... But it's time to buzz the Tower."

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      gavmh


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      Post #67121, posted on 05-01-2017 GMT-5 hours    
      It is not a resin problem only, I have and had the same issue with injection molded plastic as well when using a spray can. I think it is a matter of applying the primer.
      After cleaning the surfaces, acetone being the best for resin, apply the primer in 1 or 2 very, very thin layers. You shall just get a mist only and not necessarily covering the entire surface.
      Let it cure for a few hours and repeat the process 2 or 3 times until the entire surface is covered. It needs a certain amount of patience. Only now, you can apply the primer in thicker and wetter layers.
      If the problem already exists, you can brush on some primer covering the respective areas and sand it carefully to get a smooth surface without removing the primer.

      Kurt

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      Stevej


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      Post #67250, posted on 05-10-2017 GMT-5 hours    
      The cleaning did not yield any positive results but the misting seemed to work. Took about four passes. The problem seemed to be only on the wings and vertical stab, I haven't primed the horizontal stabs yet but expect the same. The fuselage primed just beautiful, no problems at all.

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      Tango-Bravo


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      Post #67255, posted on 05-11-2017 GMT-5 hours    
      Whether building a resin or styrene injection molded kit, it is always advisable (in my experience) to gently/slightly 'rough up' all surfaces with fine grit sandpaper...for which I retain very well-used squares of sandpaper.

      Todd
      IWA

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      Post #67256, posted on 05-11-2017 GMT-5 hours    
      Todd, absolutely. I just forgot to mention it.

      Kurt

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      Post #67267, posted on 05-13-2017 GMT-5 hours    
      Before I tried the "misting" I did wet sand it down. I haven't been in the shop now for a couple of days, plan to continue work on it today and apply decals to fuselage.