To seal or not to seal, that is the question...

Finishes, paints and coatings

To seal or not to seal, that is the question...

Postby LarryJ » Sun Oct 12, 2014 2:54 pm

I posted this in the construction section but this is probably a good question for this thread also.

I'm at the point of sanding and filling (and sanding some more...), next step is applying canvas.

Image

My question is if I should coat the whole thing with a poly mix before applying the canvas?

I'd like the extra waterproofing penetration the mix would give, but don't want to decrease the hold of the glue holding down the canvas.

Thx

LarryJ
Have Fun!!!
User avatar
LarryJ
Donating Member
 
Posts: 111
Images: 81
Joined: Tue Jul 19, 2011 10:28 pm
Location: Rancho Cordova, CA

Re: To seal or not to seal, that is the question...

Postby mikeschn » Sun Oct 12, 2014 3:10 pm

Hey Larry,

After reading the subject line, I said to myself, "Seal or course!"

After reading the details in your post, I suspect that the poly resin isn't necessary, because the glue/canvas/paint is probably all the sealant you need. But of course, I hope Glenn chips in.

Mike...
The quality is remembered long after the price is forgotten, so build your teardrop with the best materials...
User avatar
mikeschn
Site Admin
 
Posts: 19202
Images: 479
Joined: Tue Apr 13, 2004 11:01 am
Location: MI

Re: To seal or not to seal, that is the question...

Postby GPW » Thu Oct 16, 2014 7:03 am

JMHO, the canvas/glue (painted later of course) is all you really need for protection ... And you “could" add a waterproofing poly mix later to anything that didn’t get canvassed over... :thinking:

With poly first on the wood , the canvas wouldn’t adhere as well as on the bare wood , where it will stick like CRAZY ... All tests of canvas on plywood (TB2) ... the wood always failed first .. :o Try a small tests yourself with scraps ... Amazing the extra strength that canvas over plywood gives... but foremost it keeps BENT plywood from splitting and de-laminating... If I’d canvassed just the roof on my first wooden TD, I’d probably still have it ... :roll:
There’s no place like Foam !
User avatar
GPW
Gold Donating Member
 
Posts: 14911
Images: 546
Joined: Thu Feb 09, 2006 7:58 pm
Location: New Orleans
Top

Re: To seal or not to seal, that is the question...

Postby GPW » Tue Oct 28, 2014 7:37 am

Just thinking about this a little more .... It may be best in the long haul to completely seal all inner framing/floor/hatches just as a matter of course. In a wooden trailer , a canvas skin outside wouldn’t be there to purposely add strength as with a foamie’ trailer structure... although it will . So actually the plywood walls /roof/etc. could be thoroughly sealed/waterproofed, and then the canvas applied over it with a primer , such as Glidden Gripper ... which would undoubtedly stick over the waterproofing component ( Poly +MinSpts in our case) :thinking:

So Sad we’ve seen so many trailers damaged by a tiny amount of water intrusion ...  :frightened: Damage that could have been prevented by a little waterproofing protection beforehand ... :roll:
There’s no place like Foam !
User avatar
GPW
Gold Donating Member
 
Posts: 14911
Images: 546
Joined: Thu Feb 09, 2006 7:58 pm
Location: New Orleans
Top


Return to Skinning secrets

Who is online

Users browsing this forum: No registered users and 4 guests