Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: How to keep the seams from showing up on MDF?

  1. #1
    Join Date
    Dec 2009
    Location
    Madison, WI
    Posts
    206

    How to keep the seams from showing up on MDF?

    I have a set of unfinished MDF speaker boxes I'd like to finish, and was wondering if anyone has any tips as to how to prevent the seams from showing through the paint. The boxes were made some time ago and left unfinished, and the expansion of various relative pieces of MDF is visible; while the construction is solid, I'd like to know if there's anything I can do beyond sanding it flat and hoping for the best.

    Incidentally, can anyone tell me how to figure out if my black shellac is past-due?

  2. #2
    Join Date
    Nov 2006
    Location
    Delton, Michigan
    Posts
    17,472
    to me if you have seems that you dont want to see you need to cover them up with a solid piece rather than a two piece cover.. and as for the shellac try a sample out on so scrap and see if it drys.. if it does you should be ok to go
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  3. #3
    Join Date
    Dec 2009
    Location
    Kemah, Tx. - Houston Suburb
    Posts
    95

    Bondo

    I have always used automotive Bondo. Takes a few minutes to mix and apply. About 10 minutes till you can sand flush with a belt sander.

  4. #4
    Join Date
    Dec 2009
    Location
    Madison, WI
    Posts
    206
    Quote Originally Posted by Tony Bilello View Post
    I have always used automotive Bondo. Takes a few minutes to mix and apply. About 10 minutes till you can sand flush with a belt sander.
    I'll give it a try.

    What should I do to bondo before I can shellac it?

  5. #5
    Join Date
    Oct 2009
    Location
    Bradford, Vermont
    Posts
    425
    Quote Originally Posted by Joseph Shaul View Post
    I'll give it a try.

    What should I do to bondo before I can shellac it?
    Just sand it to a finish surface (320 or better).

    Black shellac???
    -- Tim --

  6. #6
    Join Date
    Dec 2009
    Location
    Kemah, Tx. - Houston Suburb
    Posts
    95

    Tim

    I seem to be running into lots of people from another life, on here.

  7. #7
    Join Date
    Oct 2009
    Location
    Bradford, Vermont
    Posts
    425


    That happens.
    -- Tim --

  8. #8
    Join Date
    Jul 2009
    Location
    Amherst, New Hampshire
    Posts
    10,604
    Veneer ?
    Faith, Hope & Charity

  9. #9
    Join Date
    Dec 2009
    Location
    Madison, WI
    Posts
    206
    Quote Originally Posted by Bob Gibson View Post
    Veneer ?
    The box has a roundover on both the top and sides - otherwise, I'd have taken the easy option. That said, I have seen seams poke through veneer before - maybe a laminate of 1/64" plywood layers before the veneer would prevent this?

    Quote Originally Posted by Tim Hofstetter View Post
    Just sand it to a finish surface (320 or better).

    Black shellac???
    I have no idea exactly what the stuff is, but it was free and it's supposed to work very well. I got it from another DIYer who was moving to an apartment and clearing out his stuff.

  10. #10
    Join Date
    Dec 2009
    Location
    Kemah, Tx. - Houston Suburb
    Posts
    95
    Joseph

    I dont ever use anyones leftover finish. Too many unknowns such as how old, temp. extremes at which finish was exposed too, contamination, etc.
    It's a gamble.

Similar Threads

  1. FYI: The Scumbags are already showing up
    By Vaughn McMillan in forum Off Topic Discussion
    Replies: 5
    Last Post: 04-19-2013, 02:22 AM
  2. Just showing off
    By Chuck Ellis in forum Lathe Project Showcase
    Replies: 5
    Last Post: 02-02-2013, 06:19 PM
  3. Pictures not showing in posts - again
    By glenn bradley in forum Site Questions and Test Posts
    Replies: 11
    Last Post: 05-31-2009, 04:40 AM
  4. just a little showing off
    By Frank Fusco in forum Off Topic Discussion
    Replies: 10
    Last Post: 12-22-2007, 03:08 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •