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Do I really need to?

To use dope under modern iron-on coverings?

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Corsair01507/10/2017 01:49:02
13 forum posts

I have recently acquired a 1973 SIG Smith Miniplane kit from an auction my club holds.

In the instructions it states I have to cover the wood in multiple layers of dope before covering with an iron-on film.

Is this really necessary with modern iron on coverings used today?

or is the dope on there for another reason?

Tom Thomas07/10/2017 04:14:31
315 forum posts
207 photos

I don't know, but I'm assuming it's referring to an older type of iron on covering that does not have its own adhesive?

Otherwise I see no reason for it.

cymaz07/10/2017 07:48:12
9284 forum posts
1200 photos

Deluxe Products do much better materials for such applications today. I have used pva/water mix and that seemed ok.

Peter Miller07/10/2017 08:12:23
11219 forum posts
1321 photos
10 articles

If you are using Solarfilm the answer is NO!

jrman07/10/2017 09:20:54
402 forum posts
3 photos

It may have been referring to the use of SIG Coverall which is a nylon type heatshrink fabric without adhesive. This required the airframe to have the adhesive (Sig Balsarite?) applied before the covering could be attached.

Former Member07/10/2017 09:33:01

[This posting has been removed]

ken anderson.07/10/2017 09:49:06
8713 forum posts
808 photos

hello Caleb, same as above from me,forget the dope and cover the model with any of the modern coverings,most have the adhesive backing....

ken no dope dept.

Graham R07/10/2017 10:26:05
364 forum posts
26 photos
Posted by Percy Verance on 07/10/2017 09:33:01:

As jrman states, this almost certainly refers to the use of SIG Koverall, which isn't available in the UK as far as I'm aware. It's a fairly dated covering system now, with more modern heat activated/adhesive backed coverings available. As already mentioned, Sig Koverall fabric didn't have any heat activated adhesive on the back of it, which was the primary reason for applying dope and/or Sig Koverite to the airframe structure.

Edited By Percy Verance on 07/10/2017 09:39:05

Graham R07/10/2017 10:29:51
364 forum posts
26 photos

Hi Percy

Sig koverall is available over here, have recently covered a 4mtr motor glider with it. It’s a lot cheaper than other heat shrink fabric coverings.

Corsair01508/10/2017 03:54:36
13 forum posts

Thanks guys! I just wanted to make sure I wasn't doing anything wrong

I am going to use solarfilm for the covering.

onetenor08/10/2017 04:32:47
1901 forum posts

One reason for the dope is to level the grain and lay any dustiness of the surface. I would still be inclined to give a coat of 50/5o dope thinners or a coat of sanding sealer. Again levels grain and lays dustiness .The main thing it does is reduce any chance of trapping air under the finish fabric or film.One of the reasons for lifting at a later date. Worth doing for the small amount of time it takes.

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