finishing purple heart problem

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Forum topic by Mike posted 03-04-2010 08:56 AM 1310 views 0 times favorited 7 replies Add to Favorites Watch
View Mike's profile


93 posts in 2586 days

03-04-2010 08:56 AM

Topic tags/keywords: question purpleheart finishing

I built a box out of purple heart with with maple corner keys or feathers and whene I put the clear finish on (wipe on poly) I have white showing in the grain. Seems to be sanding dust that wouldn’t come out. I vacumed and wiped and used a damp cloth but still had white in the grain.

Really frustrating as it’s not real attractive. Any ideas on what I did wrong.

Thanks for the help.

-- Mike, Cantral Oregon

7 replies so far

View Eagle1's profile


2066 posts in 2485 days

#1 posted 03-04-2010 12:53 PM

Purple Heart is a very hard wood. Go back and start with about 80 grit and then up..

-- Tim, Missouri ....Inside every older person is a younger person wondering what the heck happened

View richgreer's profile


4541 posts in 2495 days

#2 posted 03-04-2010 03:22 PM

Blast it with a shot of air from an air compressor at 80 or higher psi.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View Bob42's profile


456 posts in 3211 days

#3 posted 03-04-2010 03:46 PM

You might have raised the grain with the damp cloth and when you apply your finish the fibers is what you are seeing. I would re-sand, then before I apply my finish I always use a tack cloth with light pressure. Also make sure it’s not coming from the cloth. Try a sample piece first. I hope this helps.

-- Bob K. East Northport, NY

View Mike's profile


93 posts in 2586 days

#4 posted 03-04-2010 06:39 PM

I had read about useing mineral spirits on a wipe rag on a dust removal post recently. Does that raise the grain?

-- Mike, Cantral Oregon

View TopamaxSurvivor's profile


17577 posts in 3097 days

#5 posted 03-04-2010 07:23 PM

I don’t think mineral spritis will, but water definitely will.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View SnowyRiver's profile


51452 posts in 2901 days

#6 posted 03-04-2010 09:40 PM

Hey Mike…is the white in the grain all over the piece, or is it mainly near the corners? I was wondering if you might have yellow glue in the grain from the glue up.

-- Wayne - Plymouth MN

View Mike's profile


93 posts in 2586 days

#7 posted 03-04-2010 10:07 PM

no it’s not glue. Its all over.

-- Mike, Cantral Oregon

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