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Mounting Poly Paper to Coroplast

Alaska Railroad

Grumbler in Training
I am needing to mount a 14-foot by 2-foot poly paper backdrop on coroplast. What should I use as an adhesive? Coroplast is a slick surface so wall paper paste may not work. Also, we need an adhesive that does not set up quickly in case we need to reposition the backdrop slightly or roll out wrinkles.

Coroplast is a requirement as it is ultra light weight and due to MD cannot lift much weight. The backdrop will be indoors so I do not need to worry about moisture or direct sunlight.

Thanks so much for the help!
 
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Jim Miller

SPFG, Supreme Picture Framing God
Are you sure the Venetian-blind pattern of the Coroplast will not show through your backdrop after mounting? Of, would it matter?

You might be wise to ask one or more suppliers of backdrops, such as Backdrop Express, about the recommended adhesive. If the back surface is actually paper, you probably could achieve good results using acrylic gel medium. Just roll the gel onto your Coroplast, apply your backdrop and smooth it with a brayer. Dry under weight for a few days, because the backdrop's top surface and the Coroplast are both fairly non-porous.

If this might work for you, be sure to try this on a sample before you do the job for real. I've used this technique successfully for small jobs, but nothing like the size of yours.
 

Alaska Railroad

Grumbler in Training
Thanks so much for your reply SPFG!

The backdrop will be mounted to a wall so I don't think light will show through. It will cover two windows, but we will mount thin cardboard to the back of the Coroplast at these locations.

I am not familiar with acrylic gel medium. How do you roll it onto the Coroplast?
 

DVieau2

PFG, Picture Framing God
If vinyl could be an alternative to poly paper.........

Sign makers mount adhesive backed vinyl to coroplast all the time. It lasts a very long time.

You might be able to buy a 14 x 2 foot long strip from a local sign company. Lots of colors available.

Does colorpast come 14 ft long or are you making a 4 x 7.

 
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Alaska Railroad

Grumbler in Training
To answer your question DVieau2 I need to go into some additional details of the project. I am doing this as part of an Alaska Railroad HO scale train project. My backdrop will span 50 feet over 5 wall sections (see "exterior walls" labels on attached drawing).

Here are the measurements of the walls beginning with the one at left (north) and moving clockwise:
a. north wall (at left) - 6 feet 8 inches
b. east wall #1 - 10 feet 11 3/4 inches
c. S curve wall - 2 feet 11 1/4 inches
d. east wall #2 - 14 feet 3/8 inch
e. south wall - 16 feet 3 inches
Total wall length - 50 feet 10 3/8 inches

The backdrop manufacturer is providing images in 10'x2' sections. Each image lines up with the proceeding image. Although there is only two unique 10 foot images they will print additional images using mirroring. (A Original + A Mirror + A Original + B Original + B Mirror + B Original).

I plan on purchasing 4'x8' sheets of Coroplast from Lowe's. We will rip the sheets in half to create 2'x8' panels.

To add to the challenge two of the walls have windows. My wife has mandated these windows must be accessible. Therefore, I will need to remove these wall panels (north wall, 6 feet 8 inches, east wall #2, 14 feet 3/8 inch) occasionally to open windows. I have muscular dystrophy and cannot lift much weight. Coroplast is ultra light weight so I should be able to remove a 14'x2' section. My brother-in-law will construct "clips" for mounting the Coroplast to the wall.

It will be a challenge to glue two pieces of Coroplast side-by-side. For example, the 14 foot wall section will be comprised of an 8 foot section butted into a 6 foot section.

Another challenge is matching the images up on an "inward" corner. A much bigger challenge will be wrapping the image around the "outward" corner.

The biggest challenge is for us amateurs to mount the images on the Coroplast.
- The company has a "Premier" set which comes with an adhesive backing. I am betting we will screw this "instant adhering" material up. If we don't mount it squarely or have wrinkles then we are screwed.
- The company also has a "Standard" poly paper backdrop. Jim Miller suggests using acrylic gel medium. Hopefully, this would give us the opportunity to correct mistakes.

I've asked the manufacturer to provide us with a "scrap" image to use as practice. If they can't do this then I may just buy an additional panel and eat the cost.

This is a huge project and we will have 5-6 hands on board to assist. One of us works in the printing industry, but has never tackled a project this large.

Many thanks for the advice! I can use all the help I can get!
 

Attachments

shayla

WOW Framer
Hi, Alaska. Have you checked with sign companies in Clayton/Dayton, about whether they could mount it? It's possible that they've mounted same before and could be of help.
 

Jim Miller

SPFG, Supreme Picture Framing God
The backdrop will be mounted to a wall so I don't think light will show through.
When I mentioned the Venetian-blind pattern, I was referring to the texture of the sheet, not light transmission. To put it another way, Coroplast has a texture of parallel ripples. Maybe it won't show up if your backdrop is matte finished or has a busy image.

I am not familiar with acrylic gel medium. How do you roll it onto the Coroplast?
Acrylic gel medium is used by artists to condition their acrylic paints. You can buy it in jars from suppliers of acrylic paints for artists. The gel has a consistency something like sour cream; spoon a blob of it onto your board and use a paint roller to spread it around evenly. It is water-borne acrylic polymer' water-soluble when wet (and water clean-up), but water proof when dry. I guess the handling time in free air would be about 5 minutes before it begins to set up, but drying takes much longer between non-porous materials.

Another thought: If you want to splice Coroplast pieces together, you can make very sturdy joins by sticking small dowels into the air spaces between the flutes. That works only if the flutes' open ends are exposed for the splicing. You might also need to tape the joins to hide the seams.
 

Alaska Railroad

Grumbler in Training
Good idea! I will follow up with sign companies in my area on Monday. If they aren't very expensive I would gladly turn the project over to them.
 

tedh

SPFG, Supreme Picture Framing God
Only thing I can think of is 1/8th HDF, also known as Fibrex, or Masonite. Heavier, but glue-friendly.

BTW: have you purchased anything from Larkspur Line?
 

neilframer

PFG, Picture Framing God
What about Gator Board?
Very stiff, smooth, very lightweight and easy to cut.
Available in black or white, 3/16" - 1/2" - and 1" thick.
We use a lot of it in our laminating department and we get it in 48" x 96" sheets by the case.
Mostly the 3/16" thick but sometimes the 1/2" thick.
You have to be careful of the cut edges when handling (ask me how I know...:icon11:) as they can be sharp if you don't give the edges a quick swipe with a sandpaper block.

We get it locally but here is a ULINE catalogue info page..
Screen Shot 2019-12-29 at 3.46.37 PM.png
 
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DVieau2

PFG, Picture Framing God
Wow, what a cool project.

You might ask the supplier if the self adhesive stuff can be wet mounted.
Self adhesive vinyl can be dry or wet mounted.

Spraying the substrate with soapy water may seem counter intuitive but it makes positioning a breeze and the nils the likelihood of wrinkles.

You get it wet, then position and squeegee the water out the side and the rest of the moisture evaporates away.

Good luck.
 

Alaska Railroad

Grumbler in Training
Only thing I can think of is 1/8th HDF, also known as Fibrex, or Masonite. Heavier, but glue-friendly.

BTW: have you purchased anything from Larkspur Line?
HDF is a last ditch alternative due to the weight.

I have never heard of Larkspur Line. I just checked out their website and they have a lot of cool stuff! Expensive, but great!
 

Alaska Railroad

Grumbler in Training
What about Gator Board?
Very stiff, smooth, very lightweight and easy to cut.
Available in black or white, 3/16" - 1/2" - and 1" thick.
We use a lot of it in our laminating department and we get it in 48" x 96" sheets by the case.
Mostly the 3/16" thick but sometimes the 1/2" thick.
You have to be careful of the cut edges when handling (ask me how I know...:icon11:) as they can be sharp if you don't give the edges a quick swipe with a sandpaper block.

We get it locally but here is a ULINE catalogue info page..
View attachment 32486
GatorFoam board sounds like the perfect solution! I did some searching and could not find it at local stores. I can order direct from ULINE, but they require me to order a three carton (nine sheet minimum). I only need three sheets. Ordering three cartons means I throw away $128 worth of board.
 

Alaska Railroad

Grumbler in Training
Wow, what a cool project.

You might ask the supplier if the self adhesive stuff can be wet mounted.
Self adhesive vinyl can be dry or wet mounted.

Spraying the substrate with soapy water may seem counter intuitive but it makes positioning a breeze and the nils the likelihood of wrinkles.

You get it wet, then position and squeegee the water out the side and the rest of the moisture evaporates away.

Good luck.
After watching the video you posted (which was incredible!) I have asked the manufacturer if it can be wet mounted. This would be a great way to use their adhesive product while still having time to remove wrinkles and bubbles.
 

tedh

SPFG, Supreme Picture Framing God
HDF is a last ditch alternative due to the weight.

I have never heard of Larkspur Line. I just checked out their website and they have a lot of cool stuff! Expensive, but great!
He's my landlord.

Best wishes!
 

Joe B

SGF, Supreme Grumble Framer
GatorFoam board sounds like the perfect solution! I did some searching and could not find it at local stores. I can order direct from ULINE, but they require me to order a three carton (nine sheet minimum). I only need three sheets. Ordering three cartons means I throw away $128 worth of board.
Have you considered going to a frame shop to purchase the 3 sheet of Gator Board?
 

Alaska Railroad

Grumbler in Training
Have you considered going to a frame shop to purchase the 3 sheet of Gator Board?
We are currently calling every printing and frame shop in the Dayton, Ohio area. So far none of them carry 4'x8' or 2'x8' sheets. :( I am willing to expand our search to Columbus, Indianapolis and Cincinnati. It is interesting that I can get a 4'x8' sheet of Coroplast at Lowes.
 

Joe B

SGF, Supreme Grumble Framer
We are currently calling every printing and frame shop in the Dayton, Ohio area. So far none of them carry 4'x8' or 2'x8' sheets.
I am willing to bet that they don't carry the 4' X 8' sheets but that they could get that size from their distributor - it's at least worth trying to see if you could order the 3 sheets. Or maybe you can check the the framing suppliers yourself or sign manufactures/graphic design companies to see if they have Gator or MightyCore which is basically the same as Gator Foam but about 1/2 the price.
 

Rick Granick

SPFG, Supreme Picture Framing God
I plan on purchasing 4'x8' sheets of Coroplast from Lowe's.
I didn't know Lowe's sold coroplast, so I just looked it up. I have to tell you, you can do much better than that on the cost. Try a local plastics distributor or a sign company. In fact, either of those sources might be able to suggest an alternative material that doesn't have the rippled texture.

:cool: Rick
 

neilframer

PFG, Picture Framing God
We are currently calling every printing and frame shop in the Dayton, Ohio area. So far none of them carry 4'x8' or 2'x8' sheets. :( I am willing to expand our search to Columbus, Indianapolis and Cincinnati. It is interesting that I can get a 4'x8' sheet of Coroplast at Lowes.
Have you tried Laird Plastics for GatorFoam?
We get our GatorFoam delivered to us by the Phoenix branch.
They might only sell wholesale.
They might be able to give you the name of a company that buys from them and would sell to you or they might sell to you directly.
They have a branch in Dayton... (and one in Columbus, one in Cleveland and one in Indianapolis)

Screen Shot 2019-12-30 at 6.43.51 PM.png
all locations...
 
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Alaska Railroad

Grumbler in Training
Have you tried Laird Plastics for GatorFoam?
We get our GatorFoam delivered to us by the Phoenix branch.
They might only sell wholesale.
They might be able to give you the name of a company that buys from them and would sell to you or they might sell to you directly.
They have a branch in Dayton... (and one in Columbus, one in Cleveland and one in Indianapolis)

View attachment 32499
all locations...
Wow! Thanks so much for this information! We've been calling every printing business in the area and either they don't know what GatorFoam is (can you believe that!) or won't sell the product. One company might sell us the product, but could prefer to do the entire mounting process. It is tempting since they laminate and guarantee no wrinkles to bubbles. However, it ain't cheap!

I will cheap out purchasing GatorFoam from plastics companies including Laird Plastics. Thanks again for the heads up!
 
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