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Oct 10, 2012, 08:31 PM
Changing one life at a time...
JimStanmore's Avatar
From what I have found, Depron is a brand name of XPS that is not widely available in the US because of fire code restrictions. "Depron is actually polystyrene (EPS/XPS) plastic and the (EPS) means expanded while (XPS) means extruded. For our purposes, we’re only interested in the stronger, denser XPS Depron which also happens to be closed-cell foam. "
http://www.depronfoam.co.uk/html/what_is_depron.html

DollarTree foam is Readi-board made by RL Adams. It is XPS, another name for Extruded Polystyrene, which means it is the same stuff as BlueCor and FFF. I believe modelplanefoam is made by RL Adams (https://www.rcgroups.com/forums/show....php?t=1533245.) Ever since I discovered it is actually one of the the "good" foams, I have been using it exclusively. If you can't get to a store, you can order it in boxes of 50. If only it came wider than 4.5mm from DT.

http://www.adamsplasticsinc.com/atta...d%20Master.pdf

As far as the paper, any moisture removes it, so the morning dew when you are flying will take it off. I used to soak it in alcohol in a trash bag to remove, but now I do a few quick sprays of water or window cleaner, peel up the edge and roll it off on a 1" dowel. If I am worried about strength, either packing tape or WBPU will take care of it.

For lamination, I have fallen in love with rubber cement (https://www.rcgroups.com/forums/show...3&postcount=32.) $1.88 at my local Wally World. I spread it on both sides and let it dry. Lay wax paper on one sheet, line up the other one and then pull out the wax paper. Make sure the board you are working on is flat or you will get a curve. No more clamping and waiting, I can build a laminated fuselage or mono-block in a few minutes.

DTF and Glue: https://www.rcgroups.com/forums/show...r+cement+lamin

I use WBPU mixed up as Freddie's Secret Sauce (https://www.rcgroups.com/forums/show...c#post22375301) with water and talcum powder to finish. You can sand to glass smooth and fill small pits and gaps - mells real nice when sanding, too. For quick, strengthening finishes I use clear packing tape.

https://www.rcgroups.com/forums/show...highlight=wbpu
https://www.rcgroups.com/forums/show...highlight=wbpu

I really love DTF. I pick up at least five sheets whenever I go by a store and keep a stock on hand. When I see a build I like, I just grab a couple of sheets.
Last edited by JimStanmore; Oct 10, 2012 at 08:51 PM.
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Oct 10, 2012, 08:46 PM
RC Adddict
Wilfor's Avatar
Jim if you like DS foam that much you need to give MPF a try . As said before in its thread its like DS foam 2.0 , thicker, way more ding resistant . Cuts easier without tearing , forms better without cracking . Dont pickup a few sheets of the other stuff for a while and give it a try .
Oct 10, 2012, 11:32 PM
*GRAVITY* I hate it :(
Sparken57's Avatar

Question covering


Here is another covering to cover DT without the paper Kind of like colored packing tape.its stronger maybe even lighter its 17 grams per sq yard ya 3'X3' I think mono kote is 3 times or more heavier than that.
Down side cost about $1.30 per sq foot need an iron to apply and the skill to not wrinkle it.
Ok here is the question you need the iron at 175 degrees F will that work applying to DTF paper striped off or do you think that temp will melt the foam?I really believe you cant get much lighter and have a water proof colored finish.you could even add something like the fiberglass drywall tape under It (weight almost nothing). outside of cost this stuff looks very nice. I know it weighs a lot less than clear packing tape.I try ed the colored packing tape on striped DTF and it didn't stick very well. next time I will most likely put down some adhesive (very light but will still add more weight) to make the colored packing tape stick better.also I prolly should of sanded the surface and remove the dust with tack cloth I did not do that.

http://www.hobbylinc.com/coverite_rc...ring_materials
Last edited by Sparken57; Oct 10, 2012 at 11:35 PM. Reason: correction
Oct 11, 2012, 08:49 AM
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bhoov128's Avatar
I have butted two sheets of DT foam together with gorilla glue before. The difference was that I didn't trust the glue joint to support all of the join by itself so I used about 10 toothpicks to join as well, slide them halfway deep into the edge of the foam on both sides of the foam (gently and slowly) in regular intervals, remove them, coat with gg, run a thin bead of gg down the edge, slide other side of foam on, and i usually block off both ends like book ends and weight the joint down. Sandwich with wax paper. Works great and in my opinion the joint is a little stronger with the toothpicks tying them together.
Oct 11, 2012, 09:05 AM
treefinder
springer's Avatar
Sparken: don't know about the covering, but "there's packing tape and then there's packing tape" I found some stuff locally at a dollar store in 7 or so colors that is really thin but with a very agressive adhesive and am using it a lot! (almost switched from wbpu and coffee filters completely unless I need the extra strength). I make sure the foam is perfectly clean (do a wipe with wet rag to get all the dust off and kill some of the static charge) and apply tape then go over with a covering iron set about 45-50% heat setting. This stuff even shrinks around corners and curves. Hard to beat for a buck a roll. I also have a roll of OD packing tape I was given and found that one's adhesive was not nearly as good as this new stuff. I did get acceptable adhesion with the covering iron, but it didn't handle corners/curves as well. So don't give up on packing tape just yet. Haunt your dollar stores! Hey, you'll be there for the foam anyway....
Oct 11, 2012, 10:33 PM
Changing one life at a time...
JimStanmore's Avatar
Wilfor: The only thing holding me back from MPF is the cost. Right now, I buy in small lots. It is on my list to order some MPF...

Sparken: I tried low temp film, but when the iron was too low it didn't stick and too high the foam didn't like it (duh.) When I finally got the temp right I tried to cover a model and I had trouble with wrinkles no matter what I did. It was frustrating because I could turn up the heat like balsa to smooth out the wrinkles without the foam getting "unhappy" in various ways. How do you avoid the wrinkles? (See picture below)

It took so much effort for the results that I started looking at WBPU and airbrushing...

I also read several places that you should run the iron over the packing tape and that really activates the glue.

Springer: I was just looking at the Experimental Air Armin wing videos in the Scratchbuilt University and the thread has some links to carton tape that looks real good in the videos. I just got back from DT, Lowes and Wally World looking at tapes and all I could find was colored Duck (duct) tape. Is that what you are using or is it something else? There were only something like 10 feet or yards on the roll IRC and that seemed kind of short. There are 55 yds on the rolls at http://www.fast-pack.com/colored_tape.html for 2.50 and 110 yds for $3.50 ($5.95 shipping + .55 each additional roll.)

I also notice that the Armin wing has the tape applied over the paper for additional strength. He also seals open leading edges with hot glue.Do you remove the paper like I usually do or do you tape over the paper?
Last edited by JimStanmore; Oct 11, 2012 at 10:41 PM.
Oct 11, 2012, 11:13 PM
*GRAVITY* I hate it :(
Sparken57's Avatar
Quote:
Originally Posted by JimStanmore
Wilfor: The only thing holding me back from MPF is the cost. Right now, I buy in small lots. It is on my list to order some MPF...

Sparken: I tried low temp film, but when the iron was too low it didn't stick and too high the foam didn't like it (duh.) When I finally got the temp right I tried to cover a model and I had trouble with wrinkles no matter what I did. It was frustrating because I could turn up the heat like balsa to smooth out the wrinkles without the foam getting "unhappy" in various ways. How do you avoid the wrinkles? (See picture below)

It took so much effort for the results that I started looking at WBPU and airbrushing...

I also read several places that you should run the iron over the packing tape and that really activates the glue.

Springer: I was just looking at the Experimental Air Armin wing videos in the Scratchbuilt University and the thread has some links to carton tape that looks real good in the videos. I just got back from DT, Lowes and Wally World looking at tapes and all I could find was colored Duck (duct) tape. Is that what you are using or is it something else? There were only something like 10 feet or yards on the roll IRC and that seemed kind of short. There are 55 yds on the rolls at http://www.fast-pack.com/colored_tape.html for 2.50 and 110 yds for $3.50 ($5.95 shipping + .55 each additional roll.)

I also notice that the Armin wing has the tape applied over the paper for additional strength. He also seals open leading edges with hot glue.Do you remove the paper like I usually do or do you tape over the paper?
Hi Jim thanks for the tip I do have a iron on the way I will try it on my colored packing tape that's lose. I have never found the colored packing tape at Dollar tree as springer stated.What I have I ordered here link below. its very thin like 2 mill I think the best buy is the 6 pack in 2X110 .

http://www.fast-pack.com/colored_tape.html
you can google colored packing tape and get many more suppliers.
Oct 12, 2012, 03:47 AM
Changing one life at a time...
JimStanmore's Avatar
Ah, that was the link I included in my post - the prices look real good there. Scratchbuilt University had a couple of other links, but the prices were higher. The good thing is they let you pick you colors when you get a bundle.

Taping:
https://www.rcgroups.com/forums/show...g#post22973083
https://www.rcgroups.com/forums/show....php?t=1515814
https://www.rcgroups.com/forums/show....php?t=1103159
http://rcfoamfighters.com/blog/?p=426

Interesting thread on caoting foam:
https://www.rcgroups.com/forums/show...pack+tape+bond
Latest blog entry: Plans On My Build List
Oct 12, 2012, 08:41 AM
treefinder
springer's Avatar
You definitely don't want duct (or duck) tape on the plane, way too heavy. The stuff I get locally at Debbie's Dollar (I don't think it's a chain, but rather just a local store) is just packing tape: thin plastic film in different colors with tacky adhesive. The rolls are relatively small, maybe the 50 yd size, and look like they may be seconds as they have waves in the roll. But once unrolled, the tape looks fine and works well and they are a buck a roll. If you can't find anything locally, then the fast-pack tape is also good. Many guys use it.
Oct 20, 2012, 11:14 PM
Registered User
sixfins's Avatar
I'm building with $tree foam and want to use paint for color. Should I paint first, then cover with packing tape for strength, or tape, then paint over? What would be my best option, or should I consider alternative methods? Sorry for hijacking your thread, as I realize this has nothing to do with depron.
Oct 21, 2012, 12:50 AM
*GRAVITY* I hate it :(
Sparken57's Avatar

clear packing tape


Quote:
Originally Posted by springer
You definitely don't want duct (or duck) tape on the plane, way too heavy. The stuff I get locally at Debbie's Dollar (I don't think it's a chain, but rather just a local store) is just packing tape: thin plastic film in different colors with tacky adhesive. The rolls are relatively small, maybe the 50 yd size, and look like they may be seconds as they have waves in the roll. But once unrolled, the tape looks fine and works well and they are a buck a roll. If you can't find anything locally, then the fast-pack tape is also good. Many guys use it.
Just a FYI I have weighted a lot of different clear packing tape as expected the strapping tape is the heaviest but only by a gram for a 12" length The scotch 20X is about equal to scotch reg and it is stronger.The lightest I have found was bought at dollar tree & 99 cent store it is almost inch for inch HALF the weight of all the other brands.The down side is it tears easy and its hard to pull it off the end.But if you are going for light weight I would use the cheep DT or 99 cent type store. Thats my 2 cents also clear packing tape does NOT take paint well you would want to sand it to ruff the surface before painting But I would paint under PT.
Oct 21, 2012, 10:12 AM
RC Adddict
Wilfor's Avatar
If your installing packing tape and want color i would get color packing tape .
Apr 25, 2014, 02:36 PM
Foamy Fan
model plane foam is having some quality issues of some sorts according to thier web site, i hope they can get this worked out, until then I will keep building with dollar tree foam, i like to take the paper off of both sides and then 3m 77 spray two sheets together to form a 9mm thick piece of foam, you can build planes easy with this method
Jun 07, 2016, 02:44 PM
Registered User
What would be the best method for hot wiring 2 pieces of laminated DT foam to get 6mm? I have no experience hot wiring. I tried dragging a hot knife over it once. Came out terrible with noticeable shrinkage.
Jun 07, 2016, 03:22 PM
treefinder
springer's Avatar
You want to take a double thick DTF sandwich down to 6mm? Is there a reason why you need exactly 6mm? Personally, I would go with the double thickness and sand an airfoil into it if I was using it for wing or control surfaces. It will be much stiffer, and more durable than a 6mm dtf sheet.


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