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PVA glue


A mixture of PVA glue and water (thin enough so that it is easy to paint on or wipe on with a paper towel) This depends a bit on the glue itself, some people suggest 1 part PVA glue to 2 parts water. And goes up to 1 part PVA to 10 parts of water.

Paint or wipe it on and then let it dry overnight, this will leave a thin film of PVA. For PLA this solution works very well.

http://1.bp.blogspot.com/-rpefPZUpbbo/T_itAVi_aYI/AAAAAAAAHyw/wFUX3MczX1o/s1600/DSC_2036.JPG
http://numbersixreprap.blogspot.com/2012/07/pva-coated-print-bed-experiment.html