We're in 'fix-up' mode because we will be selling soon. Our basement has concrete block walls and there are a number of cracks in the mortar and a few that go through the blocks themselves. I don't see any movement, just cracks. I want to do a quick patch job on the cracks and then paint the basement walls white so everything blends in. What would be the best products to use? If there is a good 'squeeze-tube' type of patch I'm all ears. Any ideas appreciated.