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Author Topic: Contact cement in the US for mylar covering.  (Read 585 times)
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randoloid
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« on: September 11, 2018, 08:02:44 AM »

I've searched the forum before posting this, have found (and read) the pdf tutorial from the plan gallery, but I'm having trouble choosing the correct contact cement. 

My particular issue is thinning a contact cement.  I've now purchased two different brands.  (Dap from Home depot and Goop from Michaels Craft)  The Dap brand even says thin and clean up with Acetone, but when I did, it separated into a liquid and a big blob of rubber.  The Goop brand did marginally better but never completely mixed together -  I then tried thinning with Nitrate Dope thinner with somewhat better results.- I did a small test area on a crashed fuse and while it sorta stuck, it was super fragile and I want better adhesion-  perhaps I need another coat or thicker consistency with the cement.

In my research- Most of the brand recommendations came from the UK and my search yielded nothing.  Derek McGuckin's tutorial mentions Velcro brand available at JoAnn Fabrics but I can't find it there or anywhere else.

I'm building a P-30 and was excited to use mylar to keep things light, but at this point I'm ready to cover it in Isaki and be done it.- I know i can cover it well with that.

Any suggestions greatly appreciated.
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dephela
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« Reply #1 on: September 11, 2018, 09:07:00 AM »

I've never had a problem using Sig Stix-it!

https://sigmfg.com/products/sig-stix-it-covering-adhesive

Dennis
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Dennis
DerekMc
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« Reply #2 on: September 11, 2018, 01:19:27 PM »

Amazon carries Velcro brand cement:

https://www.amazon.com/VELCRO-Brand-Adhesive-Plastics-Tube/dp/B001B39PFG/ref=sr_1_3?ie=UTF8&qid=1536686002&sr=8-3&keywords=velcro+glue+adhesive

I haven't used the Velcro Cement in a long time. I use Deluxe Materials Cover Grip.  It works well and it thins with water.

https://i.imgur.com/sOul4mU.jpg?1

One of these days I'll update the tutorial. It's at least 10 years old!
Contact cement in the US for mylar covering.
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Derek
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« Reply #3 on: September 11, 2018, 01:20:42 PM »

I use Dap contact cement, solvent base, not water base. I did have the same result using acetone. What works is MEK. The problem is true MEK is not readily available in Calif. What also works, and is available in Calif, is https://www.amazon.com/FamoWood-730011-Wood-Filler-Thinner/dp/B0041NRFMS/ref=sr_1_2?ie=UTF8&qid=1536684591&sr=8-2&keywords=famowood+thinner putty thinner.

BTW - I do prefer the DAP. I t has a slight tint and I can see how much I'm applying. I thin it to the consistency of about milk.

Norm
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Tmat
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« Reply #4 on: September 11, 2018, 02:21:25 PM »

I also use DAP contact cement. I thin with Toluene (or Toluol) which we can still get in Canada. It's my favorite that I've tried (and I have tried many other adhesives!).

https://www.homedepot.com/p/DAP-Weldwood-3-fl-oz-Original-Contact-Cement-00107/100195615?MERCH=REC-_-PIPHorizontal2_rr-_-100125525-_-100195615-_-N

Tmat
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aerotrope
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« Reply #5 on: April 07, 2019, 11:53:53 PM »

I've had good results with Lepage's water-based contact cement, thinned 50% with water (natch!).  I paint it on to the balsa, let it dry 5 or 10 minutes, then while it's slightly grippy, apply the mylar.  At this point it will stay where it's put but can still be shifted.  Once I'm happy with the fit, I iron the glue lines, which reactivates the stuff and really firms up the bond.  After another 10 minutes to set, I trim the edges and heat shrink.  My usual application is tissue-over-mylar for outdoor free flight - skip the shrinking for light indoor stuff like pennyplanes.
I use cotton swabs as disposable brushes for the stuff because there is no cleaning it out.  Even thinned, it sets quickly, and permanently goops any brush used.
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aerotrope
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« Reply #6 on: April 07, 2019, 11:59:59 PM »

Just to add a bit more; for outdoor FF I mostly just use the tissue-over-mylar for the bottom surfaces of fuselages, wings, and stabs, to reduce stubble punctures.
The cement seems to work ok on mylar to mylar overlaps, as well.
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danberry
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« Reply #7 on: April 08, 2019, 11:17:26 PM »

I built a P30, covered the wing in 1/2 mil mylar. Applied using Velcro cement thinned with MEK. Wasn't happy with the thing as I thought the wing wasn't rigid enough.
Built another wing covered in tissue. Weighed the same. Won the Nats twice with it.
Mileage may vary.
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fred
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« Reply #8 on: April 15, 2019, 01:01:48 PM »

Ummm.. where, how does one buy suitable Mylar ? (in canada.. if possible)
 thanks
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DerekMc
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« Reply #9 on: April 15, 2019, 01:59:00 PM »

Ummm.. where, how does one buy suitable Mylar ? (in canada.. if possible)
 thanks

I'm not sure about Canada but FAI Model Supply carries mylar of various thicknesses.
https://www.faimodelsupply.com/product/14-mil-clear-mylar-approx-10-x-6/
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Derek
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« Reply #10 on: April 19, 2019, 12:36:41 PM »

Thank you  Happily I was already thinking of ordering some rubber from FAI.
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