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-   -   Enamel finish (http://www.diyaudio.com/forums/multi-way/55893-enamel-finish.html)

bjackson 22nd April 2005 03:02 AM

Enamal finish
 
Well, big mistake, I left my unfinished towers at home (they are done, except the finish), and I called my parents today, and they told me as a suprise they took them to be professionally painted by a friend of our family that owns an autobody shop.

Sounds good, but I was wondering what, if any, experiance any of you had with enamel with a hardener on it? Apparently it can/should be waxed and polished when finished as you would a car, (obviously am not going to take it through the car wash :-)). Any reactions I should have to this news? Should I be happy or furious?

GM 22nd April 2005 03:49 AM

Greets!

If the painter is 'worth his salt', no finish work will be required due to proper mix, application, and flow out during curing under the heat lamps.

Assuming these aren't going to be spending much/any time in a harsh environment, then the finish should be hard/glossy enough not to require any more maintenance than the usual periodic dusting/cleaning with a damp cloth, or with one of the automotive 'wipe n' shine' sprays if you feel the need to 'wax' them. The main thing is don't use anything with an abrasive cleaner in it. I repainted my daily driver black RX7 back in '93 with a catalyzed enamel and have never buffed or waxed it, only wiping it down with a 50/50 mix of white vinegar/water after an Ivory dishwashing soap bath to maintain the shine and prevent hard water spots.

Anyway, assuming it's a color you like, then be happy. :)

GM

ppfred 22nd April 2005 03:51 AM

Hi,

Be happy. Be very happy.
You obviously have never had the pleasure of painting, sanding, painting, sanding.... (6 to 10 coats), else you would'nt be asking.

fred p.

planet10 22nd April 2005 07:08 AM

Quote:

Originally posted by ppfred
Be happy. Be very happy.
What he said....

I've given thot more than once to getting speakers finished this way...

What colour? Pictures?

dave

mwmkravchenko 22nd April 2005 12:22 PM

Ditto
 
THe worst part of a project is getting it to look good. You have no idea how much work you have avoided.

Mark

bjackson 22nd April 2005 12:45 PM

I have an idea. I spent last few weekends bondo-ing and sanding because my woodworking skills are well.. non existant. The whole box was sanded, primed, sealed, and bondo'ed, when delived to be finished. I know there is a lot of work left to do, but the prep was hard too!

Jim85IROC 25th April 2005 07:24 PM

As long as the surface is prepped properly, an automotive grade finish can provide stunning results.

Here's my Tangband computer speakers covered with a 2-stage Urethane basecoat/clearcoat automotive finish. After painting, I wetsanded and buffed, followed by a couple coats of automotive polish:

http://www.sover.net/~iroc85/Jim-Tangband1.JPG

My only complaint, which isn't really related to the finish, is that the expansion/contraction of the MDF has caused visible lines to show at the wood joints. I need to investigate with various wood sealers to prevent my MDF from becoming effected by environmental conditions.

planet10 25th April 2005 07:49 PM

Quote:

Originally posted by Jim85IROC
I need to investigate with various wood sealers to prevent my MDF from becoming effected by environmental conditions.
Plywood instead of mdf?

dave

mwmkravchenko 25th April 2005 07:50 PM

MDF EDGES
 
The only answer to the movement problem is to mitre all the joints. The edges and the surface absorb moisture differently because of being a differents density. So there will always be a difference in the expansion and the contraction. Mitreing hides most of this problem. I've done quite a few gloss black cabinets that still look good with technique.

MArk

ppfred 26th April 2005 05:24 AM

Quote:

Originally posted by Jim85IROC
My only complaint, which isn't really related to the finish, is that the expansion/contraction of the MDF has caused visible lines to show at the wood joints. I need to investigate with various wood sealers to prevent my MDF from becoming effected by environmental conditions.
I have the same problem, although I wonder if it is caused by expansion/contraction of the MDF. The visible lines are actually depressions along the seams/joints. The joints were filled using glue (polyurethane, which expands) and Bondo.

I'm wondering if with time, the glue and/or bondo have ever so slightly shrunk & the paint of course got pulled in. This can be seen to occur when finishing a porous wood such as red oak if no filler is used. After about 6-8 weeks what was a smooth and even finish is pock-marked where the polyurethane continued to dry/cure/shrink and sunk into the tiny crevices.

Also, it should be noted that some paints need up to 30 days of cure time before final sanding/polishing/buffing. Dry time and cure time are completely different animals.

I have just finished another project using MDF and am waiting before I apply the final finishes - about another 4 weeks or so. I'll keep you posted. We shall see what we shall see.

fred p


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