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  #1  
Old 03-15-2010, 05:36 AM
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Default Does wet MDF ever shrink back?

I had a little water damage to my track over the weekend. Some rain water ran along an over head heat pipe and landed on my track in a few areas. It didn't affect the painted areas but it got into the slot in a few areas and caused some swelling. I know I'll probably have to pull up the tape sand it down repaint and retape in a few areas. On the small chance that it might dry and shrink back I figured I would ask. If I do have to fix it though I think I'll take some pics and post a how to repair water damage thread. Maybe make the repaired areas a different color so they look like they were repaired by a 1/32nd road crew LOL
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Old 03-15-2010, 05:45 AM
rubber2ice rubber2ice is offline
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It may reduce a little, but generally speaking it does not return to its original form....
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  #3  
Old 03-15-2010, 11:32 AM
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no

once MDF gets wet, it is ruined. it becomes a host for mold, will no longer hold fasteners well, & becomes structurally weak. in its application in our hobby, once you have machined it, it should be painted on all exposed surfaces to prevent it from absorbing moisture.
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Old 03-15-2010, 12:10 PM
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Yeah thats what I thought I have two small areas where a little water tracked across the painted road and found the slot. The other area the water found where two boards meet and got between them . Both areas are about a half inch wide and three or four inches long. I don't think it swelled more than a 16th of an inch high but when the cars race over the areas you can see them jump. I'm hoping this weekend I can pull the tape up, sand it down, repaint and and re tape the damage.
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Old 03-15-2010, 03:07 PM
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While routing one of my tracks I accidently knocked over a extra large Dunkin Doughnuts coffee on the track-it ran mostlyonto the floor but some went right into the slot. It swelled up,but after acoulpe days it had dried and I sanded it and painted the area with Kills primer. No more problem. I think the key is making sure you let it dry totally before you try any kind of fix. Good luck.
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  #6  
Old 03-15-2010, 03:46 PM
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if you got a hunk of steel put in the oven for a few min you want it hot but not to hot were it smokes or sets on fire if your steel block is heavy enough just set it on the bad spot if not add wieght to the block, this will draw out the moister and help shrink but you will have to do some repair
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  #7  
Old 03-15-2010, 03:56 PM
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If that parts turns out to be ruined don't panic. Just cut out that section and put a patch in, sand reroute, paint and replace that section of tape. No biggie.

Mike A

Last edited by Nor Cal Mike; 03-15-2010 at 03:57 PM. Reason: Typo
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  #8  
Old 03-15-2010, 07:54 PM
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for a small swell; sand it so the grain is open, squirt in CA glue, let it cure, then sand it & paint it over again.
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  #9  
Old 03-16-2010, 05:13 AM
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Sorry to hear you had track damage With the weather you folks have had glad its not worse.
I'm also glad others have experience repairing this damage,its bound to happen.

A question for those "in the know".... Is there a moisture resistant mdf ? What kind of exposure can painted mdf withstand ? Sorry 2 questions.

Hope all works out on your track repair, keep us posted, K?
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Old 03-18-2010, 05:03 AM
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Default Track repair done

I started to fix the water damage last night. I did the work at night because I didn't want to affect rush hour traffic, any one from Jersey will know what I mean . It really wasn't worth posting any pics the swelling went down quite a bit as it dried. Last night I pulled up some tape , sanded the areas down and repainted. I let it dry till tonight and retape.
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  #11  
Old 03-18-2010, 07:15 AM
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2fer:

The answer to you question is no.

Think of the MDF as paper with epoxy holding it together.

It's up to the user to water proof it. That's why I'm an idiot about priming and painting the stuff.

JW
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  #12  
Old 03-18-2010, 10:57 AM
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Ran home for lunch and retaped all the sanded areas. Test drove all 3 lanes and the track runs like nothing ever happened .
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  #13  
Old 03-18-2010, 01:15 PM
ramcatlarry ramcatlarry is offline
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And ANOTHER good reason to paint all surfaces - including the slot.

I had a portable oval that saw snowcones and rainstorms. Sealed the slots and drilled drainage holes in the bottoms of the slots.....
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  #14  
Old 05-14-2010, 02:38 PM
samboss samboss is offline
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Default my portable track

Hi, my portable track got a bit of water damaged it is under the bridge how hard is it to cut the bridge off and put back in place.
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  #15  
Old 05-15-2010, 04:02 AM
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Could be a bit of a bugger
Tell us about your track, a picture or two would help to understand the situation.

Basic repair would be cut the bridge where the splices could have back-up board under the track that the track surface was screwed down to. A thin blade saw would also be helpful so you don't have to fill so much,

Did you build this track?

Also ...... welcome to SCI
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