Yoichi Saotome bow question

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#1 Umbamabumba on 1 year ago

Hello! I made a bow out of two sheets of 6mm EVA foam last year for my Yoichi Saotome cosplay. I stacked the craft foam in four layers for thickness and inserted metal rods into the handle and both sides of the bow for stability, (I placed the small metal rods between the eyeballs on the bow and the handle.)
In order to give the bow extra stability I covered the foam with modge podge covered newspaper.

However, during the creation process the edge on the left side of the bow became warped and cirved itself upward, while the other side stayed straight. I tried to weigh the warped side downward in an attempt to straighten out the warped side. But it didn't really straighten the bow out as the foam just went right back into its curved position.
I heard that using an iron, hair dryer or heat gun can be used to shape and straighten foam, but duebto the newspaper covering, I am afraid that using a heat gun,iron,etc would burn the newspaper covering or ruin the bow in another way.

But, anyways I was wondering if using a heat gun,iron or hair dryer on newspaper covered EVA foam would work to straighten out the warped edge without ruining my bow?
Or would heating the warped-newspaper covered side ruin the bow and I should try to find a different method to straighten my bow?
If another method exists to straighten out warped paper-mache covered EVA foam it would be greatly appreciated as well.

Any help with this matter would be greatly appreciated.
I attached a picture of the bow in question it's a little hard to tell from the image, but the top side is curved outward on the other side of the bow.

[URL="https://imgur.com/a/DaMClwn"]https://imgur.com/a/DaMClwn[/URL]
[URL="https://i.imgur.com/m9SwDMc.jpg"]https://i.imgur.com/m9SwDMc.jpg[/URL]
[URL="https://i.imgur.com/tiWuY22r.jpg"]https://i.imgur.com/tiWuY22r.jpg[/URL]
[URL="https://renaul.deviantart.com/art/Owari-No-Seraph-Gekkoin-bow-682300883"]https://renaul.deviantart.com/art/Owari-No-Seraph-Gekkoin-bow-682300883[/URL]

#2 CapsuleCorp on 1 year ago

There is no picture.

I don't have an answer, because I don't work with EVA foam precisely because it gets ruined so easily, but I do have a suggestion. If you don't use heat to try to fix it, it remains warped, right? Well, if you DO use heat and it either doesn't work or ruins it, you're pretty much still in the same situation - a ruined bow. I'd say give it a shot because whether you try it or don't try it, you're probably going to have to remake the bow anyway.

My money is on nothing happening, not due to the newspaper but due to the modpodge. It's a glue layer, once hardened it's probably hella hard to ever reshape it.

You may want to look into an alternate method if you do have to remake it. Sculpting with an airdrying substance that can be sanded or patched if it looks wrong, or worbla, or something else entirely.

#3 Umbamabumba on 1 year ago

[QUOTE=CapsuleCorp;5067039]There is no picture.

I don't have an answer, because I don't work with EVA foam precisely because it gets ruined so easily, but I do have a suggestion. If you don't use heat to try to fix it, it remains warped, right? Well, if you DO use heat and it either doesn't work or ruins it, you're pretty much still in the same situation - a ruined bow. I'd say give it a shot because whether you try it or don't try it, you're probably going to have to remake the bow anyway.

My money is on nothing happening, not due to the newspaper but due to the modpodge. It's a glue layer, once hardened it's probably hella hard to ever reshape it.

You may want to look into an alternate method if you do have to remake it. Sculpting with an airdrying substance that can be sanded or patched if it looks wrong, or worbla, or something else entirely.[/QUOTE]
[URL="https://imgur.com/a/DaMClwn"]https://imgur.com/a/DaMClwn[/URL]
[URL="https://i.imgur.com/m9SwDMc.jpg"]https://i.imgur.com/m9SwDMc.jpg[/URL]
[URL="https://i.imgur.com/tiWuY22r.jpg"]https://i.imgur.com/tiWuY22r.jpg[/URL]
[URL="https://renaul.deviantart.com/art/Owari-No-Seraph-Gekkoin-bow-682300883"]https://renaul.deviantart.com/art/Owari-No-Seraph-Gekkoin-bow-682300883[/URL]

I am quite sorry for not adding the pictures earlier as I was being rushed from place to place while writing my post, as a result I was only able to post my topic at the time.
Anywho, here are a few photos of my bow as a reference
I was thinking of possibly peeling away the paper layer covering the place where I would try to heat the foam up..But,I didn't consider that the modge podge would be problematic when it comes to using heat to reshape my bow.
At this point in time it is very difficult for me to completely remake the bow as I wouldn't have enough time to get the new foam and remake the bow before July 7th.. (The bow took me a month to make last time I did it..)
I was thinking of either remaking the warped edge itself, (annoying, but do-able), using the bow at the convemtion "as is", or just heating the edge anyways and see how things work out.. (hopefully the bow doesn't catch on fire or smell to high heaven.)

#4 Penlowe on 1 year ago

So, not being familiar with the character, I didn't see any problems with the bow. I.E. if you do nothing, only a small percent of people will know it's not perfect.

I have heated glue covered foam. It was a dreadful mess, it basically liquified the glue.

I have found from experience (always the cruelest teacher) re-making half or a portion of something is not worth the time. Because your skills, time available, and even materials can change. The newly re-made section often looks a lot better or a lot worse than the un-touched portion, plus the transitional area is often weakened.

Therefore, my advice is:
1) use it as is
OR
2) make a new one from scratch

#5 becosplay on 1 year ago

Like others I do not have a proven solution. Before you try any technique on your finished bow, do you have some scrap material to make a few small pieces so you can test out corrective ideas? I was trying to determine/guess what caused the original bow to curve. Water/humidity/moisture (perhaps even from the glue) can make paper curl. Then the glue may have dried holding it in the new curved shape. In that case putting a weight on top after it was dry would not correct the problem because one side is slightly larger than the other side. If the weight was put on while the layers were still wet, that should help keep it flat as it dries. Mod podge will soften when soaked in water, which might allow you to reform the shape, weigh it down and let it re-dry. However the wet glue can turn cloudy and may nor re-dry completely clear.

#6 Umbamabumba on 1 year ago

I recently tried two different heat methods for myself earlier today and here is what I found.
1:Iron
I placed a towel on top of the area for a few seconds and it didn't seem to do much in terms of straightening out the foam. Afterwards I placed the iron directly onto the foam for a few seconds, and the only thing that happened was that the paint was lifted no gluey mess.
But, again didn't seem to do much in terms of straightening the bow out.
2: Heat Gun
I placed one side onto an outdoor picnic table and swept the heat gun across the surface of the warped area for a few seconds. After which I placed some pressure onto the area and attempted to twist the area back into proper position. Then, I did a few more quick sweeps of heat from the gun across the area, before I placed a medium weight object on top of the area to weigh it down. I then did the same thing across the other side of the bow and placed weights onto the area, after the area was cooled down a little.
I left the bow weighed down for an hour before having to rush outside to retrieve it due to the rain.
During my first attempt with the heat gun I noticed that some parts of the news paper were starting to crinkle, but none of the glue was oozing out. However, the area exposed to the heat gun was more straight then it was previously.

After bringing it inside, I flipped the bow around to the other side that wasn't exposed to the heat gun. I noticed that the other side was now sticking upward in certain parts, but not nearly as bad as it was when I started.
I swept the heat gun across the surface of the bow for a few seconds again, and held it downwards/twisting it into proper alignment, then placing a a medium weight book on top of the area, when it was cool enough to touch.
I then repeated the process on the other section of the bow.

As of this moment the bow still has the weights on top of it so I don't quite know what the other side looks like. But, it turns out that this far it seems to have worked with little damage to the bow.
But, if this method doesn't work, I will more than likely leave the bow alone in order to prevent the glue from truly liquidating,.since I was lucky that it didn't.
However, I will have to repaint the areas that were dullen due to the heat.

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