austinswamp

Mammoth tusk

27 posts in this topic

Ptychodus... what sort of PVA beads do you use for this?  I am a Vinac maker and it is also a polyvinylacetate (PVA) but does  NOT dissolve in H2O at all.  

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10 minutes ago, jpc said:

Ptychodus... what sort of PVA beads do you use for this?  I am a Vinac maker and it is also a polyvinylacetate (PVA) but does  NOT dissolve in H2O at all.  

 

You are correct, it doesn't dissolve in water.

 

This is my understanding of the process. An emulsion is basically a suspension. Polyvinyl acetate will absorb around 5% water. The heat helps the disbursement of the PVA and the water to be absorbed. All you're really doing is getting the PVA wet and slathering it on the surface of the fossil. When the water evaporates, it leaves behind a layer of PVA.

 

I use B-15 for my consolidation material but I personally, NEVER use an emulsion. So, in all honesty it's really a theoretical knowledge that I'm espousing.

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