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Thickening sanding sealer

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Can anyone please advise as to what I can use to thicken sanding Sealer? I am using a "Rohacell" a polystyrene type material which is pretty open grained, and I need a smooth finish after sanding. I have heard that SS can be thickened by using talcum powder. Is there a better solution? Thanks.
 
You have given the reply in the question. Talcum powder.

If you want to make your own you can in fact just use varnish with talcum added.

Ian M
 
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