Styrofoam as everyone pointed out is very weak or delicate, nothing sticks to it and most all solvents attack it. DIY Doc. Use plastic to wrap the painting to keep it clean and protect the finish. You might try gesso, (available among the paints) to prepare the ball. I’ll repeat what another answerer said, too… quality can be critical. Sanding paper or hand sander( medium to a fine grit)3. You can use a regular craft sealant such as Mod Podge, or you can target the styrofoam specifically and use something like Foam Finish. It is green and certian styles of it is already smooth so you can start painting right away, but if you can't find it in the shape you want then this turorial is for you. ^-^So there you have it sealing styrofoam. But I would seal the Styrofoam with Mod Pod or something similar to make it smooth, it will also prevent the styrofoam from being destroyed from the spray paint. And try all! There are many reasons you would want to do this! Let the medium dry for 24 hours after the final coat. Mix two parts plaster of Paris to one part water in a large bowl, being careful to remove all lumps. Best is not to use it if what you are making is worth saving as ‘’art’’ or something you will want to keep. Sealing your Diamond Painting will lock all of the diamonds in place and significantly increase the longevity of your finished project. Price wasn't listed. As others have said an exterior latex won't damage the styro, and may last as long as painted on a house. Do you need to seal air dry clay before painting? Purchase a craft acrylic paint in your desired color. Keep your artwork looking as good as the day it was completed by learning how to apply a varnish layer. I first gave the bare styrofoam an undercoating of resin mixed with black pigment, and then a second coat without any pigment, covering a small area at a time. Using a sealant is important because it protects the furniture from peeling or cracking of paint. Relevance. Acrylic paint will work also. 7. Lv 7. Paint a thin coat of roofing sealer onto the Styrofoam with a paintbrush to seal in any crumbles. (I expect you know, but always tear your paper strips for papier mache--they'll blend better,with less visible seams.). After I got rid of smooth surfaces and created a rock type wall, I bought some expanding foam to create more depth of field. Acrylic is the safe way to go on Styrofoam. Obviously I need to seal the balsa before I paint it with enamel paint so the paint doesn't soak through. It is advisable to wear a face mask while doing the sanding to protect from inhaling small particles. Once you’ve finished painting the chair, let it dry for at least 24 hours. When foam insulation is installed on walls, sanding is not necessary. Here is a suggestion on sealing Styrofoam with paint. Apply a varnish or sealant. When covering Styrofoam it can be difficult to keep a smooth shape. You apply the sealant first to the styrofoam object you wish to paint with either a foam brush or a paintbrush. Possibly using white tissue paper and painting the design after the glue dries would be successful for your needed effect. It si quicker and if some cases you may have to apply it twice if you want a ultra smooth surface.Now lets look at cheaper alternatives to sealing styrofoam cuz face it folks paperclay can get costly if your are making a really big prop made out of styrofoam and the economy is'nt being kind to you right at the moment.Supplies:1.Styrofaom ( Shape of your choice)2. I would try a tinted roof-seal product, it has a bit of stretch to it because it's silicone-based. 2 Cups of water5. I just want a smooth sealer that can be painted on without it melting. I applied 4 layers to this, but the more layers you add the better it's up to you.Once it is dry it is ready for painting. It all depends on what effect you want to achieve if you would seal the wood before or after painting. Styrofoam is used in many craft projects, ranging from costumes and plant displays to sculptures and theatre sets. painting styrofoam is an incredible material to use for makes, as it’s too lightweight and comes in numerous shapes and sizes. And now all you have to do is allow the plaster of Paris to dry completely. There are many reasons you would want to do this! Answer Save. 3.Paint brush O.k I used a slab of styrofoam and chop sticks to prop up the balls for painting. PaintbrushMixing the 2  glues and water together brush thin layers of the solution onto the surface of the styrofoam.In this example I am using my Lynn Minmay rings that I used for her wig. When you paint the gesso onto the styrofoam you may notices some small black specks appearing onto the surface. Essential when doing craft work or decors use plastic to wrap the painting to keep it clean and protect finish... 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