Beading or Wetting Out


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Revision as of 03:48, 27 June 2011

Beading and Wetting Out are contradictory terms that are useful when describing how a product behaves and can or cannot be used in conjunction with another. Beading is when one product is applied over another and it does not exhibit good adhesion and has a tendency to “bead” up and crawl from the applied surface. This exhibits a high surface tension between the applied and the substrate and reveals that because short term adhesion is difficult, that long term adhesion will most likely be poor. To avoid poor adhesion make sure the two materials are compatible. If so, then a light sanding of the surface can sometimes offer enough tooth in order to accept the product that previously had beaded up.

Beading of paint or glaze on another surface is caused by the existence of too much surface tension. This could be a sign that the layer beneath has not fully dried and still has volatiles migrating out of the surface.

Ways to get around this: speed up the drying sand lightly and remove particles

On the opposite end, wetting out refers to when a product flows out and covers another surface. There is little surface tension between these two coatings and this is a good indication that adhesion is likely. Wetting out also refers to when a product is saturated in order to prepare it for further working, manipulation or flattening out.

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