I can recall working with an old guy who was a pretty good decorator and well skilled at his trade and there were occasions when he would use pva . You know when PVA glue dries when it is no longer white. I have filled and sanded my walls in numerouse parts, can i use pva to seal/prime the filler before painting. PVA and Uses With Timber Apr 11, 2007, 03:48 PM #12; Rodney. PVA based wood filler is a poor substitute for a cascamite based easy sand filler. We need to mix the PVA with water because it’s far too thick to apply as a stand-alone material. Paint a coat of PVA glue mixture evenly on your applied mortar. Some companies PVA’s are weak, thin and very poor in quality so get a decent one. I use my stock of Cascamite to make my own wood filler. While that is getting tacky.. have the amount of filler you need ready and add about a teaspoonfull or more of neat PVA before adding the water and mix in the usual way...fill the area(s) and leave a little proud .The adhesive in the mix bonds with the prepared area . I’ve found that if you mix a small batch of plaster and glue, a bit heavier on the glue, that you can paint over the surface to fill in the bubbles. When exposed to water, PVA will actually dissolve, which makes it a very useful support structure material for 3D printing. Using a small brush ...paint in some neat PVA into the hole(s). We recommend the Unibond products – their mix is thick and acts as a great sealer for plaster. However I am told that the pva/sawdust mix will go brittle over time and work out of the gaps. Allow the mixture to dry. Hi, my local timber merchant has offered me sawdust if I want to use it for floorboard gap filler with PVA. Can I fill the floorboard gaps with the PVA and sawdust mix and THEN sand the floorboards afterwards? That way you can get high-quality filler, whether water-based or not. Painting a coat of PVA on the surface before the cement mortar is applied can even further increase this adhesion. The glass results in a white colored filler, the phenolic a walnut brown. The general mix for PVA is 3 parts water to 1 part PVA (3:1). The reason I recommend using high-quality filler is that PVA, even when fully dry, tends to clog up the belts when you are sanding the filler off the surface (I’ll explain in a moment). Mix two parts PVA glue with one part water in a bucket. You can see what it looks like in the ‘Mixture 3 Smooth’ picture above. PVA, or Polyvinyl Alcohol, is a soft and biodegradable polymer that is highly sensitive to moisture. Rodney. Registered User. There are two common types of micro balloons, glass and phenolic. Dip a paint roller into your mixture and allow it to absorb some of the PVA mix. Alternatively, you can use PVA glue, or better (and cheaper), PVA glue watered down. PVA glue is only good as a filler when mixed with balsa dust and then only to build up an area before you do the final coat in Bondo. I’ve seen a suggestion that the filler can be a mixture of sawdust and pva. Or is there a reason I shouldn't do this? I'd love to do the filling before the sanding for logistical reasons too boring to go into here! Then you can sand them smooth (thanks to the wood glue). PVA can be added to a cement mortar mix to give the mix a) slightly better waterproofing qualities and b) advanced adhesion to the surface it is applied to. You may have experienced the use of PVA glue mixed with sawdust as a wood filler. The beauty of this filler is that it is hard enough so you can sand it easily. 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