Reply by CharlesNeil

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Posted on Help! Poly doesn't want a crack 'er scratch.

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2399 posts in 3864 days

#1 posted 02-12-2012 03:46 PM

the number of issues that can cause this is unreal , contamination in the seam, or the seam is slightly open , which will cause most finishes to repel from a sharp edge, finishes flow, and sharp edges dont allow them to flow over and into, lets fix it,>>>> once the coat is dry, use some Nahptha to clean the seem good , then if you have some, take a little shellac and using an artist brush apply some shellac in the seam, it will seal any contamination off, including wax, HOWEVER if the poly is oil base, be careful an uncured oil poly can be “lifted” by the shellac, shellac is a sure cure all, BUT BUT BUT, before doing that, simply put some poly in the seam, ( dry surface around it ), a small brush, or whatever, wet the seam , then using a clean finger, ( yes finger) simply wipe the poly ,working it around to force it into the seam, let dry , scuff sand and if needed do it again, to get the seam back to flush and rock and roll,

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