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Old 10-12-2013, 08:40 PM   #1
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Bondo on MDF crown?


Put some crown moulding up yesterday (all by myself) and it looks really good even though its not painted yet. Right now its just primed.

I do have one issue though, and that is what I am calling my crown "expansion joint" (yeah I know, I know, measure twice cut once )

Gap is about 1/8th on the only butt joint in the room. Can I use bondo on MDF? I have crawfords painters putty but I am thinking that this will take years to dry to paint.

The moulding is 4 1/4 cove so no major fiddly detail to worry about.

Thanks

Robyn

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Old 10-13-2013, 05:44 AM   #2
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Bondo on MDF crown?


A good caulk would be better(IMO)

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Old 10-13-2013, 06:07 AM   #3
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Bondo on MDF crown?


Morning Chris....yeah probably would have been better. Holy freakin cow that stuff stiiiiiinks. I was wearing the respirator and had a fan in the window and two blowing into the room and the house still stunk. Don't plan on ever using it again. Although it did get rid of the "expansion joint" lol.
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Old 10-13-2013, 07:43 AM   #4
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Bondo on MDF crown?


What kind of caulking did you use?
It should have been latex that has no smell.
Sounds like you used silicone, which can not be painted.
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Old 10-13-2013, 08:21 AM   #5
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Bondo on MDF crown?


Bondo is about the worst product you can use for wood patching/gap filling.
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Old 10-13-2013, 01:35 PM   #6
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Bondo on MDF crown?


Quote:
Originally Posted by Gymschu View Post
Bondo is about the worst product you can use for wood patching/gap filling.
I like it schu not for every day ,but its nice to have a can of bondo in your van .but yes caulk it and be done
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Old 10-13-2013, 01:43 PM   #7
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Bondo on MDF crown?


use a drywall setting compound (easy sand 20) mix it up and fill the crack. sand it out and paint it
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Old 10-13-2013, 02:22 PM   #8
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Bondo on MDF crown?


Joe - I used the bondo for the bigger gap - that was the reference to the stinky stuff. The caulking is done correctly. No sillycone here :P

Prince - Thought about hot mud just not sure if it will crack later on or not.

Robyn
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Old 10-13-2013, 04:28 PM   #9
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Bondo on MDF crown?


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Originally Posted by forcedreno2012 View Post
Joe - I used the bondo for the bigger gap - that was the reference to the stinky stuff. The caulking is done correctly. No sillycone here :P

Prince - Thought about hot mud just not sure if it will crack later on or not.

Robyn

It would and so might the bondo
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Old 10-13-2013, 10:18 PM   #10
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Bondo on MDF crown?


We have found that using "Big Stretch" caulk (by Sasco)
for all our crown trim - at the ceiling and wall, as well as any other gaps we can eliminate the inevitable cracks. It's not cheap ($6 per tube), but when you count your time, it's worth it.

www.sashco.com/hi/bigstretch.html

I think we got ours at an Ace Hardware.

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Old 10-14-2013, 07:28 AM   #11
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Bondo on MDF crown?


Bondo is an absolute crapshoot especially for DIY. What's usually needed is a small to very small amount and to get the right amount of hardner is difficult, too much and impossible to sand, not enough and it stay soft. Also bondo can flash really bad.

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