How many coats of glue/water primer?

Emprov · 9th April 2006, 09:34 PM

I'm building a sub out of MDF and I'm experimenting with a piano finish. I've just brushed on the first coat of primer, (50/50 glue and water), and I'm wondering how many coats y'all typically apply. Is it ideal to sand w/440 or above between coats?

Cal Weldon · 9th April 2006, 09:47 PM

I may be wrong but isn't that a lot of water in with the glue? I wonder if that will cause swelling?

ShinOBIWAN · 9th April 2006, 09:49 PM

PVA + water mix isn't a great way to seal the cabinets. It works but there's more effective treatments:

Specially formulated MDF primer:

http://www.international-paints.co.u...1&surfaceid=48

And the best is a resin based wood hardener:

http://www.decoratingdirect.co.uk/viewprod/b/BONWH/

Apply one of those in generous quantities and then sand back smooth with an orbital palm sander and ~400grit paper.

Be prepared for a ton of work and use lots and lots of automotive primer after you've sealed the cabinets with one of the above.

ShinOBIWAN · 9th April 2006, 09:51 PM

Quote:

Originally posted by Cal Weldon
I may be wrong but isn't that a lot of water in with the glue? I wonder if that will cause swelling?

Yep it is rather a lot, more like 1.5:1 is better.

Emprov · 9th April 2006, 09:51 PM

50/50 is the mix that seems to be stated over and over again around these parts. I was concerned about swelling as well but it actually seems to dry pretty quickly and I can't see any evidence of expansion.

Emprov · 9th April 2006, 09:55 PM

Quote:

Originally posted by ShinOBIWAN
PVA + water mix isn't a great way to seal the cabinets. It works but there's more effective treatments:

Specially formulated MDF primer:

http://www.international-paints.co.u...1&surfaceid=48

And the best is a resin based wood hardener:

http://www.decoratingdirect.co.uk/viewprod/b/BONWH/

Apply one of those in generous quantities and then sand back smooth with an orbital palm sander and ~400grit paper.

Be prepared for a ton of work and use lots and lots of automotive primer after you've sealed the cabinets with one of the above.

Man, I wish I would've posted something a few hours ago!

Guess I'm pretty committed to glue and water at this point, I'll give it a light sand and give it another coat with a thicker mix.

9th April 2006, 09:34 PM	#1
Emprov diyAudio Member Join Date: Feb 2005 Location: Kaleefornia	How many coats of glue/water primer? I'm building a sub out of MDF and I'm experimenting with a piano finish. I've just brushed on the first coat of primer, (50/50 glue and water), and I'm wondering how many coats y'all typically apply. Is it ideal to sand w/440 or above between coats?

9th April 2006, 09:47 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I may be wrong but isn't that a lot of water in with the glue? I wonder if that will cause swelling? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
primer for fiberglass	pjoseph	Subwoofers	5	4th August 2009 12:03 AM
Fi Primer 807	Klimon	Tubes / Valves	2	13th November 2007 07:58 AM
A cooling Primer?	Pbassred	Solid State	9	29th March 2007 06:00 PM
Loudspeaker primer for the novice	Stephen	Multi-Way	16	17th December 2003 02:01 PM
Water cooled plate on ebay (possible water cooled amp application)	BrianGT	Parts	1	27th May 2002 04:19 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th April 2006, 09:49 PM	#3
ShinOBIWAN diyAudio Member Join Date: Feb 2004 Location: UK	PVA + water mix isn't a great way to seal the cabinets. It works but there's more effective treatments: Specially formulated MDF primer: http://www.international-paints.co.u...1&surfaceid=48 And the best is a resin based wood hardener: http://www.decoratingdirect.co.uk/viewprod/b/BONWH/ Apply one of those in generous quantities and then sand back smooth with an orbital palm sander and ~400grit paper. Be prepared for a ton of work and use lots and lots of automotive primer after you've sealed the cabinets with one of the above.

9th April 2006, 09:51 PM	#5
Emprov diyAudio Member Join Date: Feb 2005 Location: Kaleefornia	50/50 is the mix that seems to be stated over and over again around these parts. I was concerned about swelling as well but it actually seems to dry pretty quickly and I can't see any evidence of expansion.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)