blotches on wood

sluggo · Post by **sluggo** » Fri Mar 21, 2008 2:33 pm

Hi there,

I wet the hull this morning to raise the grain and I noticed maybe a dozen spots where the wood was blotching and lighter in color. My guess is that there is glue residue on these spots, which doesn't let the wood get wet and darken. Any other ideas on what it is from?

thanks

Glen Smith · Post by **Glen Smith** » Fri Mar 21, 2008 3:54 pm

I can't make out much in the picture but white blotches on wood is normally caused by glue residue that hasn't been removed. You could try scraping then sanding with 80 grit and 120 grit but don't just work on those spots with the sander or you will create an unfair surface.

Larry in Champaign · Post by **Larry in Champaign** » Fri Mar 21, 2008 7:01 pm

No doubt about it, that is glue residue. I'm guessing from your past posts that your first sanding was with 60 grit. From the amount of obvious residue shown in your photos and the haze residue (much more subtle) I would suggest another complete, light sanding with the 60 grit. Are you using a nice soft pad along with an interface pad? I like the extra soft pad with an additional interface pad, 60 grit paper and fairly low speeds to scour the glue residue off. It seems that when the glue is gone the hull is well rounded and if stripped fair will remain fair. Keep at it as that residue really looks ugly under glass!

Good luck,

Larry

sluggo · Post by **sluggo** » Sat Mar 22, 2008 1:43 am

Thanks guys.

Where do you get a soft interface pad? I've seen one on the Newfound woodworks website, that's the only one I've seen

cheers

Larry in Champaign · Post by **Larry in Champaign** » Sat Mar 22, 2008 5:16 pm

I got my interface pad and backing pads from TOOLBARN.COM.

http://www.toolbarn.com/product/makita/743022-A/

Even though my sander is a Bosch, the Makita pad works on any 5", 8 hole hook and loop sander backing pad.