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Making a box is harder than one might think.
Making a box is harder than one might think.
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Old 23rd June 2018, 12:31 PM   #151
MattSug is offline MattSug  United Kingdom
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So I’ve reached the stage of getting about 4 coats of gloss black sprayed on my boxes and I’m wondering what next to get that piano gloss finish. The speakers have that slight orange peal, faint brush stroke finish. Would people recommend doing a wet or dry sanding now with a high grit (1600?) paper next? Or should I just keep on with more top coats or a higher grade sand paper. Don’t want to mess up these stages!!
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Old 23rd June 2018, 07:09 PM   #152
tapestryofsound is offline tapestryofsound  Scotland
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Originally Posted by MattSug View Post
So Iíve reached the stage of getting about 4 coats of gloss black sprayed on my boxes and Iím wondering what next to get that piano gloss finish. The speakers have that slight orange peal, faint brush stroke finish. Would people recommend doing a wet or dry sanding now with a high grit (1600?) paper next? Or should I just keep on with more top coats or a higher grade sand paper. Donít want to mess up these stages!!
Actually, the orange peel finish you now have can look very attractive - but if you want to go for the full piano finish it will be quite a challenge. You would have to wet and dry sand down the surface by hand, working through the grits starting somewhere around 600 and gradually working up to 2000. Make sure the paint is fully hardened before you start. And change the paper frequently.

Then you can start varnishing. Or, if so inclined, give a final spray coat, and leave aside the idea of a piano finish for another build some other time.

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Old 23rd June 2018, 08:07 PM   #153
paulys55 is offline paulys55  United States
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I'm in the process of finishing my cabinets right now and though I do not want the piano gloss finish, I went with a black satin and will finish with a coat or two of clear. I am using the rattle cans which is not ideal but I am getting pretty good results. Started by sanding all sides with random orbital sander until all joints (butt joints in my case) were flush. Then sealed gaps and end grains with wood glue. Sanded smooth. Two coats of primer. Sand with 320. Two coats of paint. Sand until smooth with 320. Third coat. Sand with 600. Fourth coat. Sand with 1000. Final coat, wet sand with 1000. Finally hit it with 2 clear coats. I found a wealth of information in this thread....

Best way to finish MDF -

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Old 24th June 2018, 03:35 AM   #154
Jerms is offline Jerms  United Kingdom
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Originally Posted by MattSug View Post
So Iíve reached the stage of getting about 4 coats of gloss black sprayed on my boxes and Iím wondering what next to get that piano gloss finish. The speakers have that slight orange peal, faint brush stroke finish. Would people recommend doing a wet or dry sanding now with a high grit (1600?) paper next? Or should I just keep on with more top coats or a higher grade sand paper. Donít want to mess up these stages!!

Develop a method using a small area on the back of one of the speakers. I would try very fine sandpaper or wet/dry on a pad, either orbital sander or by hand, then maybe go to something like T cut.
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Old 24th June 2018, 04:13 PM   #155
phivates is offline phivates  United States
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I'd say you have found the limit of rattle can paint application. A proper spray rig makes it possible to tweak the material with certain additives, depending on what you are using.
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Old 25th June 2018, 04:59 AM   #156
chrisb is offline chrisb
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Old 25th June 2018, 12:17 PM   #157
MattSug is offline MattSug  United Kingdom
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So I started wet sanding last night using an 800 grit. My heart was in my mouth as the wet sanding seemed to be pretty quickly removing most of the black finish!! Iím just not sure if I was doing this right. I think possibly using too much water? I was trying to use almost no pressure, but still the layers seemed to be flying off.

I think the biggest problem for me is not knowing how good (good enough) is at each stage. I feel I could have sanded more but then I would have ended up with no black paint left! Anyway on with another coat of black and they look better than last time, Iím guessing bit more sanding then another coat? I know someone said it would be a challenge, I guess my worry is knowing when enough is enough?

Really annoyingly I clipped one of the speaker cases on the garage door frame on my way back into the garage, so I have a chip to repair as well!!
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Old 25th June 2018, 07:56 PM   #158
DIYNick is offline DIYNick  United Kingdom
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For small scratches use car body knifing putty, otherwise it is just a case of building up paint layers and then knocking it back to get a flat surface.

By-the-way, put a tiny bit of washing up liquid in the wet n dry water
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