What happened to my paint ?

[Older&Slower]

Hi Everyone,
I hate to drag single wide mfg homes into this site but ......... Last Summer I had to put newer skirting on it. I couldn't afford new plywood, so I got plywood from a moving and storage company. I bought Zinsser's oil base cover stain and added just a splash of black oil base paint which gave me gray. After the Winter and a few hail storms I saw that the paint was coming off. I'm starting to wonder if if that ply was sprayed with something that ruined the paint job.

 

[oldognewtrick]

It's hard to tell in the pic, but are the spots at nail locations?

 

[Older&Slower]

Shallow knots in the wood, but no holes

 

[oldognewtrick]

How many coats of stain did you apply? Was the ply clean, dull and dry?

 

[bud16415]

Sap in the knots is my guess and bleed thru. hit the spots a few coats with something like kilz original primer and give it a new coat of the oil based stuff you tinted.

The shipping ply was the right price, but may not last a long time.

I have a shed / workshop behind my garage and it was a mess when we bought the house. I didnt want to spend a lot on siding so I covered it with rolled roofing and screwed strips of wood every 18". I did an outhouse that way 45 years ago and it still looks good. on a roof that stuff lasts a couple years at most but on outside walls it really holds up.

Maybe something like that over your plywood would help. just an idea.

 

[Older&Slower]

How many coats of stain did you apply? Was the ply clean, dull and dry?

Yes it was

 

[Older&Slower]

Sap in the knots is my guess and bleed thru. hit the spots a few coats with something like kilz original primer and give it a new coat of the oil based stuff you tinted.

The shipping ply was the right price, but may not last a long time.

I have a shed / workshop behind my garage and it was a mess when we bought the house. I didnt want to spend a lot on siding so I covered it with rolled roofing and screwed strips of wood every 18". I did an outhouse that way 45 years ago and it still looks good. on a roof that stuff lasts a couple years at most but on outside walls it really holds up.

Maybe something like that over your plywood would help. just an idea.

I might go with the Kilz. Thank you

 

[Jeff Handy]

Knots might just be catching and holding water.
You could try filling them with exterior spackle.
Or Bondo type of resin filler.
There is also a primer for chalky surfaces, I forget if Behr or Kilz or whoever makes it.
It helps to glue down powder and flakes before putting on a new top coat.

 

[Older&Slower]

Knots might just be catching and holding water.
You could try filling them with exterior spackle.
Or Bondo type of resin filler.
There is also a primer for chalky surfaces, I forget if Behr or Kilz or whoever makes it.
It helps to glue down powder and flakes before putting on a new top coat.

I'm going to have to buy an orbital sander and start all over again with maybe some Kilz ........ Thanks Jeff

 

[Jeff Handy]

Harbor Freight has cheap good ones.

 

[Jeff Handy]

You could also just use a plastic grill scrubber to knock off the loose stuff.
Or a gentle pressure washer on a wide fan spray.
Let it dry for at least a week before new stain or paint.
I would carefully pressure wash before busting my back and arms with a sander.

 

[Jeff Handy]

https://www.amazon.com/BBQ-grill-grate-cleaner-Scrapers/dp/B018823HZG/ref=asc_df_B018823HZG/?tag=hyprod-20&linkCode=df0&hvadid=167145798705&hvpos=&hvnetw=g&hvrand=1790854615661633259&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9021527&hvtargid=pla-306007400528&psc=1

 

[EricK]

Zinsser Bin shellac primer is the best at sealing sap and preventing bleed through. I love the stuff.

 

[Older&Slower]

Zinsser Bin shellac primer is the best at sealing sap and preventing bleed through. I love the stuff.

I used that a long time ago and was very happy with the results. I bought the wrong Zinssers product this time. Thanks for the message

 

[EricK]

I used that a long time ago and was very happy with the results. I bought the wrong Zinssers product this time. Thanks for the message

Zinsser Bullseye 1 2 3 is my favorite primer. I'm surprised at how nicely it sprays. But for sap bleed through, Zin Bin is the best.

 

[Older&Slower]

Zinsser Bullseye 1 2 3 is my favorite primer. I'm surprised at how nicely it sprays. But for sap bleed through, Zin Bin is the best.

Got it

 

[bud16415]

I believe the original Kilz is the same shellac base.

 

[Jeff Handy]

One benefit of that shellac base is that it dries fast.
You can put two coats of Kilz on pretty quickly, then topcoat, all in a few hours, get paid and client is happy.
Great for repairs like exterior trim or spongy windowsills.

 

[Older&Slower]

It's hard to tell in the pic, but are the spots at nail locations?

Knot really (a little joke there)