"Jay Chan" wrote in message
ups.com...
I have mistakenly applied water-based latex primer on my particle
board book case that I am building. Now the areas where I have
applied water-based latex primer have raised grain excessively. I
have tried sanding the raised grain. But I can only sand away the
high spots, and I cannot sand enough to remove the low spots (primer
keeps clogging the sand paper doesn't help either).


The problem here is that you do not have "raised grain". Sawdust can no
longer have raised grain. What you have is a ruined panel. Time to replace
the panel.


Snip


Is there a better way to deal with this problem?


Consider this a lesson learned and start over. Your time is certainly worth
more then the material.
Keep your water based finish but make your first coat of sealer be shellac.