You can use a filler for the crack. I just use wood filler. you can then cut new grout lines but they often do not line up. most kits come with down spouts (wire) that you can place to run down the crack to cover it up. For painting the windows I have found that painting the building the window color gives evenly painted windows. then I just hand paint the brick. The brick paint will not be even but neither are the colors of real brick. Then grout the groves with your favorite method. With the Korber kits make sure you sand the back sides and ends to remove the paint that is on the walls from Korber. if you do not you are just gluing to paint which will not give any strength. when you build your models you will see all of the defects. once you place them on the layout with other things you will not be focusing on the defects and see the whole building and details around it. the defects will virtually disappear.
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