You may need to carefully cut the tube open in order to get to it. Painting over painted metal is one of those jobs that anyone with a little patience can master. The term 'pour painting' is in reference to the paint being poured onto the canvas.There are several methods of pouring that will give differing results. Use it in the tube by adding water (try to fold the edges of the tube so you don't have any sharp edges that'll damage the hairs on a brush). Another way paint can become exposed to air is through small cracks or openings in the tube itself. Acrylic paint does not adhere well to particularly smooth surfaces. After drying, painting can commence. Use a enamel primer, I spray paint mine and then paint over with acrylics. Take a look at the paint in your temporary container for discolorations as well as large pieces of dried binder or solidified pigment. The end result is totally worth the effort, as a neat repainting job can last for many years. Cut open the tube so you can access the paint. 3 Answers. Free Acrylic Painting Lessons On Youtube: Art Supplies. Artists who like the slow drying time of oil paints, but still prefer the versatility and permanence of acrylics, can either use a retarding medium or buy interactive/open acrylics, which is a relatively new form of acrylic paint that is manufactured to include a retardant that can slow drying time down to as long as a few weeks. The key to a successful repainting job is to thoroughly sand and prime the metal surface. Plastic tubes seem more durable but they have a different problem. Anonymous. Can be painted directly to metal too, but might require several layers for good result. She also explains why it’s important to use only the quality art supplies even if you are just at the beginning of your learning. Acrylic pour painting with the Swirl technique. Relevance. ok so i was painting and using a new tube of paint but whan i opened it it was blocked by some metal thing and i cant squeeze out the paint hel;p? 10 years ago. A simple pouring technique where even beginners can achieve beautiful results.You do not need silicone here. Favorite Answer. Take care not to cut yourself on the tube. In order to overcome this problem, metals should be sandpapered or sandblasted before applying paint. 'dirty cup' or 'Flip cup' - This is when the paints are all added into one cup then the cup is flipped and lifted. You will then need a container for permanent storage of the paint once you are done (I like to use the glass Testor's mixing bottles for that). After the right texture is achieved, an industrial primer should be applied to the metal surface. Metal tubes can break open along the larger creases. Answer Save. how to open and use a tube of acrylic paint? 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