MDF finishing -- absolute best method

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Very nice.

Could you explain the powder-coating method?

I just spent the past 3-4 months doing a high gloss black finish on my new build but I have zero equipment so I rollers and thinned oil based paint (60/40 with mineral spirits). The results are great for me (lots of wet sanding 600 and 1000 grit) but it took a LONG time.
 
Wrong! Polyurethane is a cross-linked poly finish that can not be recoated successfully. Just ask any poly manufacturer if their finishes can be "toched up" after a 24 hour period. That answer is NO!

Based on the above and some of your other responses on this subject it's fairly obvious you need to educate yourself before you sew on that experts badge.
😉

Polyurethane can be re-coated, regardless of the number of day that have passed. To be successful you need to clean and sand the surface first - it then becomes the new substrate for subsequent coats.
Scratches and even gouges in polyurethane can be completely repaired - I have done it many time my friend. Knowledge, skill and technique.
 
Based on the above and some of your other responses on this subject it's fairly obvious you need to educate yourself before you sew on that experts badge.
😉

Polyurethane can be re-coated, regardless of the number of day that have passed. To be successful you need to clean and sand the surface first - it then becomes the new substrate for subsequent coats.
Scratches and even gouges in polyurethane can be completely repaired - I have done it many time my friend. Knowledge, skill and technique.

Sorry, but you do not have a clue if you believe your ststements! Read the work of woodfinishing experts and then tell me you are correct. You may have done it, but it is not an industry accepted practice! Recoating urethane does not bond to the previous surface, as lacquer, shellac and regular varnishes do. Do as you choose, but you are wrong. Propagation of this type of nonsense is not a good idea.
 
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You are very knowledgeable, aren't you? The high end gear, tubes, cables and now finishing! Wow, so diverse - a true Renaissance man! An expert on all these and more, no doubt.
I'll not argue with you Curly, I know what I know and I've talked about this here too many times before.

All I can say to anyone else reading this: use the resources at your disposal, such as Google to find reliable sources for information.
Here's one: WoodAnswers.Com - Wood 101 for Do-It-Yourselfers

Here's another: http://www.doityourself.com/stry/wfpolyurethane
 
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You are very knowledgeable, aren't you? The high end gear, tubes, cables and now finishing! Wow, so diverse - a true Renaissance man! An expert on all these and more, no doubt.
I'll not argue with you Curly, I know what I know and I've talked about this here too many times before.

All I can say to anyone else reading this: use the resources at your disposal, such as Google to find reliable sources for information.
Here's one: WoodAnswers.Com - Wood 101 for Do-It-Yourselfers

Here's another: Polyurethane Info | DoItYourself.com

As I said read the finishing experts opinions. I never stated that I was an expert. I just know what I have read and I abide by their opinions. I owned a hardwood lumber business, I did not play with wood only on the weekends 🙂
 
You make me laugh Curly! 😀
I play with electronics on the weekends (no tubes though - I'm not stuck in the past) and work with wood all week, have been for more than 25 years.
You would do well to have a little humility and give others the benefit of the doubt - some of us know a thing or two.

Here: Go to your local Home Depot and read the application instructions on a can of urethane (I know you don't have any on hand, that finish doesn't "sound" good 😀). Go on, I dare you 😉
 
You make me laugh Curly! 😀
I play with electronics on the weekends (no tubes though - I'm not stuck in the past) and work with wood all week, have been for more than 25 years.
You would do well to have a little humility and give others the benefit of the doubt - some of us know a thing or two.

Here: Go to your local Home Depot and read the application instructions on a can of urethane (I know you don't have any on hand, that finish doesn't "sound" good 😀). Go on, I dare you 😉

Well here is a web site that states what I already mentioned.

Lacquer versus Polyurethane

Stick to electronics. It more your speed 🙂
 
You know nothing of me and nothing in general, apparently...

The link you provided gives inaccurate data on urethane. You should update your "expert" sources to ones that are true and unbiased.
 
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