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Discussion Starter #101
I sanded on it for most of the day and applied woodfiller to ever blemish and sanded some more. I have pics on camera but can't load at the moment.

I put a coat of primer on. Going to add another and sand it smooth. Then hopefully when I add the black it will look good.
 

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Here's a step by step how to paint MDF from a member.

The steps, as I remember them:
1) Sand all the joint edges smooth with 100 grit.
2) Use vinyl spackle or bondo to fill in any gaps, no matter how small.
3) Re sand after it dries.
4) Using a spray primer, make a first pass over all the "ends" of the MDF that are exposed.
5) Prime the rest of the MDF in light passes
6) Re-prime the ends again after doing the flat surfaces.
7) Allow to dry and repeat as necessary. The edges soak up primer and paint by the bucket, so it is important to hit it first and let that set in and dry before continuing. If it looks like it needs a bit more, it probably does. Primer is cheaper than paint and sands easier, so always err on the side of more priming. Several light passes and waiting 15 minutes is better than glopping it on.
8) Lightly sand the primer with 220 grit and wipe down. If you sanded through any primer touch up as necessary.
9) Apply coats of paint like the primer: raw edges first, flat surfaces, then a quick light pass over the edges again.
10) Repeat coats as necessary. For paint usually 2 is enough if you used enough primer. Sand lightly between coats if anything looks rough or uneven, but only 220 grit or so. Wipe clean.
11) Optional: top coat with a water-based satin or semi-gloss polyurethane in the same manner.

Read more: Finishing MDF - Home Theater Forum and Systems - HomeTheaterShack.com
 

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Discussion Starter #104
Got the 3/4 inch birch on all sides last night. Did alot of sanding, then did a 1/2" roundover with the router to all edges, and then did some blemish fixing today. that birch has quite a few air pockets in it when its cut. Also cut a 2" hole in the back for the Terminals. I took two 4"x4" pieces of 1/2 mdf and glued them together. One of the pieces had a 2" hole cut in it and another had a hole just big enough for the wires to go through from the terminals. I put this inside the box and aligned it with the 2" hole. Also sealed it with caulking. When the wires are in place i will silicone them in. I couldn't see making this tank of a box, cutting a hole in it and putting just a thin piece of plastic in its place.....

Before i put the first coat of primer on with a brush, i took an air blower and blew out the instide and outside. Then shop vaccumed the inside cuz the blower didn't do anything lol. Also wiped down the outside with a damp rag. so far so good
 

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Discussion Starter #107
Sheez! You don't need any help, you're the teacher. Excellent!
LOL, i'm trying. I know if it doesn't come out good, the MRS won't let me do anything else

Beautifull work - if you don't mind me asking - what was that glue you used?
Thanks, Tite bond III

What are you going for paint-wise?
I ONLY use PL premium if it is a tapped horn enclosure or I have a gap to fill. If not then it is Titebond II for everything else. PL gets all over everything and is so much harder to clean that normal wood glue. I almost avoid projects that require PL due to the mess.
I remember you mentioning that in the beginning of the thread, but figured i would try both. Tite Bond is just easier to sand. When i cut the circular hole out of the back of the box, i took the cut out and tried to knock them apart.... there was no ripping the mdf wood and the Brich wood apart. That gue is good stuff





I woke up early this morning and finished priming. I got 3 good coats over the entire box. I waited about and hr or two between each to let it dry completely.

The primer i used was Zinsser Bullseye 1-2-3

I am going to let the box completely dry, then sand it down smooth and see about putting a black glossy finish on it
 

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Let's see . . . . it's about 9:15AM here now and you put on 3 coats this morning waiting about an hour between coats . . . . you might as well stay up all night, all day and just GIT ER DUN!
OH WAIT! Today's Mother's Day you better have something left for the Mrs. I know, take her to McDonald's "She'll be lovin it".
 

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Discussion Starter #109
I already had one coat on last night, left for a crawfish boil, then came back and did almost a full coat. Didn't want to stay up an hr just to roll it over to do other side. So this morning i rolled it, finished that side and then did the rest. wasn't that bad

Got it sanded. I can tell that the more coats you have on it, the better.

Right now i am going to go kill two birds with one stone. Taking daughter up to momma's work to give flowers and balloons, the stopping by to pick up paint. not sure if i will go with spray paint or can.
 

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From a distance it looks great.
Up close, you can see the sanding marks, irregularities, and blemishes. I think to remove everything that ends up easily visible, will take another weeks worth of sanding, filling, and priming.
 

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Discussion Starter #113
That was all of the brush marks from the primer that was visible. i noticed when i was sanding this morning that it was taking alot of the primer off of the wood to get everything smooth. and i didn't want to take it all off, so i sanded alot without going all the way to the wood. but still didn't seem good enough. So thats why i mentioned earlier several coats would be best.

I went to lowe's and got A qt of gloss black from valspar . I was using Gloss black spray paint from rustoleum. Also decided to try a 3/16" nap roller.

When i got home i started spreading this stuff out and noticed right off the bat that it definately was not going to be a mirrored finish. So a few choice words were muttered, and i went all over the box with it. figured i would just let it dry for a day and sand it down. To my suprise, this thing looks great with a textured finish. Its not the finish i had in mind, or even considered when i started but I like this alot.

It had started raining outside so i brought it in my garage to finish. Took some pics and the flash kinda gives it a grey color.
 

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Discussion Starter #114 (Edited)
so after lots of time and effort........and paint, here is what i ended up with. It is dry to the touch in these pics. I applied several light coats to try and get rid of any uneven areas that was seen in the glossy pics. I am happy with it, think it turned out pretty good, now its time for bed
 

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That looks really good.

For a first time build I have a hard time remembering anyone doing such a good job in such a short amount of time.
 
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