PMF on OSB?

Finishes, paints and coatings

PMF on OSB?

Postby martymcfly » Sun Nov 06, 2016 11:39 pm

I am thinking about building a tongue box for my atv trailer out of some OSB scraps that are left from putting a new roof on my buddies moms house. I am thinking about trying PMF over OSB. Will the TB2 stick to OSB? Is OSB smooth enough to PMF?
martymcfly
Teardrop Advisor
 
Posts: 90
Joined: Tue Feb 25, 2014 4:53 am

Re: PMF on OSB?

Postby rowerwet » Mon Nov 07, 2016 6:20 pm

thicker fabric for the PMF helps to hide surface imperfections, you might also try building the box then sanding it with a belt sander to get a smoother surface.
I haven't done much with OSB, but it might be a good idea to seal the OSB with THE MIX to help stabilize the surface so you don't get buldges down the road from moisture.
User avatar
rowerwet
Gold Donating Member
 
Posts: 2050
Images: 521
Joined: Mon Apr 20, 2009 12:52 am
Location: Merrimack River Valley

Re: PMF on OSB?

Postby elcam84 » Tue Nov 08, 2016 10:13 am

What is PMF. Is it FRP ?

Sent from my SM-T320 using Tapatalk
elcam84
Teardrop Master
 
Posts: 121
Joined: Thu Oct 30, 2008 2:59 pm
Top

Re: PMF on OSB?

Postby MadMango » Tue Nov 08, 2016 11:27 am

Poor Man's Fiberglass, which is canvas impregnated with TiteBond II.
MadMango
"Art without engineering is dreaming; Engineering without art is calculating." ~Quentin Stafford-Fraser

You can see my design planning, The Mobile Mango.
You can follow my TTT build here, The Mobile Mango
User avatar
MadMango
Teardrop Master
 
Posts: 152
Joined: Wed Aug 24, 2016 3:40 am
Location: Space Coast, FL
Top

Re: PMF on OSB?

Postby tony.latham » Tue Nov 08, 2016 2:44 pm

I am thinking about building a tongue box for my atv trailer out of some OSB scraps


When I built my tongue box, I was amazed at how long it took. Granted, it has a hinged holder inside for the additional solar panels and then there's the aluminum and trim. It seems like it was a two week project.

Image

Image

I'm in the "I hate OSB camp." The stuff is junk. It gets damp, it swells and never shrinks back down. And it's not TB2 friendly (like bare wood is). It was made to save $700 per house. Do yourself a favor and buy a sheet of 1/2" ACX (the CDX has too many voids). It'll cost you about $25 and will be much more resistant to moisture (but seal the interior with the mix too) plus you'll have that nice smooth surface to lay your PMF on. That kind of an investment for a two-week project is nothing.

Tony
Image
User avatar
tony.latham
Silver Donating Member
 
Posts: 2238
Images: 17
Joined: Mon Jul 08, 2013 4:03 pm
Location: Middle of Idaho on the edge of nowhere
Top

Re: PMF on OSB?

Postby MtnDon » Tue Nov 08, 2016 4:42 pm

A big ditto to what Tony says. OSB has certain uses, all in residential construction. It is miserable stuff once wetted. As Tony says it expands and stays expanded. At that point the wood strands also loose glue adhesion. Plywood with an exterior rating is the way to go. ACX is much better than the CDX
Our 6x12 deep vee nose cargo trailer camper conversion... viewtopic.php?f=42&t=58336

We have a small off grid cabin we built ourselves in the NM mountains; small PV solar system; 624 watts PV, Outback CC & inverter/charger ... http://countryplans.com/smf/index.php?topic=2335.0
User avatar
MtnDon
1000 Club
1000 Club
 
Posts: 1931
Images: 6
Joined: Sun Aug 19, 2012 10:57 pm
Location: New Mexico
Top

Re: PMF on OSB?

Postby elcam84 » Tue Nov 08, 2016 7:51 pm

Advantech doesn't have the moisture issues that regular osb does and has like a 5 day in the rain guarantee but I still wouldn't use it much for campers etc.
Also FYI if you want a water resistant mdf you can use medex

Sent from my SM-T320 using Tapatalk
elcam84
Teardrop Master
 
Posts: 121
Joined: Thu Oct 30, 2008 2:59 pm
Top

Re: PMF on OSB?

Postby MtnDon » Tue Nov 08, 2016 10:50 pm

Advatech is great stuff for house sub floors. Thinnest is 19/32... most common is 3/4 or thicker. Sort of more than is needed for a box, IMO
Our 6x12 deep vee nose cargo trailer camper conversion... viewtopic.php?f=42&t=58336

We have a small off grid cabin we built ourselves in the NM mountains; small PV solar system; 624 watts PV, Outback CC & inverter/charger ... http://countryplans.com/smf/index.php?topic=2335.0
User avatar
MtnDon
1000 Club
1000 Club
 
Posts: 1931
Images: 6
Joined: Sun Aug 19, 2012 10:57 pm
Location: New Mexico
Top

Re: PMF on OSB?

Postby Xanthoman » Tue Nov 08, 2016 11:50 pm

MtnDon wrote:Advatech is great stuff for house sub floors. Thinnest is 19/32... most common is 3/4 or thicker. Sort of more than is needed for a box, IMO
my only experience with advantech was garbage. I have built many custom homes and the worst subfloor weathering I ever saw was done with advantech. I would not recommend it for anything! But for a trailer box I would recommend 3/8 CDx or scrapped packing crate ply (1/4-5/16 even). pmf will make a solid part with the added skin strength and the small size will make it a strong unit in the first place. I know people like to overbuild but I see no need; remember the strength of the whole unit is greater than the sum of its parts!


Sent from my iPhone using Tapatalk
Xanthoman
Teardrop Inspector
 
Posts: 24
Images: 3
Joined: Sat Sep 24, 2016 2:02 pm
Top

Re: PMF on OSB?

Postby Xanthoman » Tue Nov 08, 2016 11:59 pm

martymcfly wrote:I am thinking about building a tongue box for my atv trailer out of some OSB scraps that are left from putting a new roof on my buddies moms house. I am thinking about trying PMF over OSB. Will the TB2 stick to OSB? Is OSB smooth enough to PMF?
having worked with osb a lot (scraps from my house builds) I would say it is perfectly doable. Like others have noted it does have water issues when left to soak it up, and certain glues are watery enough to set it off. It does glue well though, but I have only seen clamped gluing with it; not open faced surface treatment like this scenario. A decent exterior primer (zinsser bullseye) applied on it then canvas applied and primer again on top with a final coat of exterior should hold fine from my experience with the materials and others with pmf in general. As for using scrap osb see John heisz' osb stool...


Sent from my iPhone using Tapatalk
Xanthoman
Teardrop Inspector
 
Posts: 24
Images: 3
Joined: Sat Sep 24, 2016 2:02 pm
Top


Return to Skinning secrets

Who is online

Users browsing this forum: No registered users and 1 guest