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If you really want to warm your sealing mixture do what they used to do in the lead paint days. Get a block of metal stick it in the oven for a while to warm it to 150-200 degrees and drop it into your sealing mixture. It will definitely increase the viscosity of the product. But if your are using an oil based sealer and want better penetration try penetrol. That stuff works great and you don't need to heat anything.
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