Streaking on Polyurethane Finish

by alan on January 17, 2010

Here’s another question posted on do it yourself.com. My answer’s below. (Slightly edited)
re finishing furniture

Quote:
Originally Posted by alacheta View Post
I have a recently purchased dining room set (table, chairs, hutch, buffet, coffee table, end table) all of which are valued as mid grade product. They look good, but are made with a softer wood and really don’t have a protective finish on them. We have already noticed some scratching and pitting.

As a protective measure I’ve started down the path of putting some coats of a Satin finish polyurethane on them. I started with a standard type that I brushed on with a foam brush. I noticed when it dried there were a lot of streaks in the finish even after sanding down with 4’0 steel wool and wiping down with mineral spirits. I always apply with the grain and I’ve been careful to not over apply.

In a strategic move, I switched to a poly that you wipe with a rag thinking that the foam brush was causing the streaks. I’ve put on about 4 coats and while the streaks are not nearly as noticeable, if you look at the pieces on different angles under the lights you see them.

Can you offer any suggestions at this point? Should I apply any more coats, sand down more? I have only done the three tables and have not started the chairs or the buffet/hutch yet so any suggestions for avoiding this in the future are also appreciated.

Thanks for your help.

What type of polyurethane are you using? If it’s water based use synthetic brush.  It will help.  See my other posts. Silicon is present in household spray cleaners it may be causing the streaking. How well did you prepare the furniture? Preparation, or lack of  nearly always holds the key!  This might be what is affecting your finish. Hope this helps! good luck

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