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Author Topic: Dope. Filling the grain or filling the weave?  (Read 3523 times)

Offline Craig Beswick

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Dope. Filling the grain or filling the weave?
« on: December 19, 2016, 02:36:24 PM »
Hi guys,
I have been out of modelling for a long time so I'm trying to get up to speed with the best way to go about things. I understand a lot is personal preference,  or in some cases just the way it has always been done.

I'm filling wood grain with dope. Do I put enough clear to completely fill the grain and have the surface be slick or do I apply just enough coats to allow for the covering material to have a layer of dope to stick to?

I'm thinking that layers of dope have to be applied to fill the grain of the covering material anyway, so why is it necessary to completely fill the wood grain?
Any offerings greatly appreciated.
Craig

AUS 87123
"The Ninja"

Offline Allan Perret

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Re: Dope. Filling the grain or filling the weave?
« Reply #1 on: December 19, 2016, 02:58:22 PM »
Hi guys,
I have been out of modelling for a long time so I'm trying to get up to speed with the best way to go about things. I understand a lot is personal preference,  or in some cases just the way it has always been done.

I'm filling wood grain with dope. Do I put enough clear to completely fill the grain and have the surface be slick or do I apply just enough coats to allow for the covering material to have a layer of dope to stick to? 

I'm thinking that layers of dope have to be applied to fill the grain of the covering material anyway, so why is it necessary to completely fill the wood grain?
Any offerings greatly appreciated.
Craig


Yes, 2~3 coats to adhere covering, then dope till weave of covering is filled.  Will get there sooner if you add talc, cornstarch,  or zinc sterate to dope.
Allan Perret
AMA 302406
Slidell, Louisiana

Offline Craig Beswick

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Re: Dope. Filling the grain or filling the weave?
« Reply #2 on: December 19, 2016, 06:50:27 PM »
Thanks for that Alan.
I have used Talc added to dope, thick, as a wood filler before.
I use about a 4oz pot to thin my dope, a couple of teaspoons of Talc?
Much appreciated
Craig
AUS 87123
"The Ninja"

Offline Allan Perret

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Re: Dope. Filling the grain or filling the weave?
« Reply #3 on: December 19, 2016, 07:04:27 PM »
Thanks for that Alan.
I have used Talc added to dope, thick, as a wood filler before.
I use about a 4oz pot to thin my dope, a couple of teaspoons of Talc?
Much appreciated
Craig

No, I would say 1 heaping tsps. for 4oz. 
Allan Perret
AMA 302406
Slidell, Louisiana

Offline Craig Beswick

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Re: Dope. Filling the grain or filling the weave?
« Reply #4 on: December 19, 2016, 08:30:02 PM »
Thanks Alan,
I did read something, I'm not sure if it was a thread, saying to add Talc and using it when it started to, "Rain", to the bottom. May have been a Bob Hunt article.
Anyway thank you for the clarification.
Craig
AUS 87123
"The Ninja"

Offline john e. holliday

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Re: Dope. Filling the grain or filling the weave?
« Reply #5 on: December 19, 2016, 09:43:34 PM »
From my experience to much talc in the dope and the dope too thick and it will crack or as some say have spider webs.  I going to post what Larry Renger has caused me to try and I love the out come.  Just need more practice.
John E. "DOC" Holliday
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AMA 23530  Have fun as I have and I am still breaking a record.

Offline Chuck_Smith

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Re: Dope. Filling the grain or filling the weave?
« Reply #6 on: December 24, 2016, 06:29:02 AM »
Not a bad idea to add a couple drops of color to the filler too. Helps you see what you're doing. Just enough drops to tint it.
AMA 76478

Offline Larry Renger

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Re: Dope. Filling the grain or filling the weave?
« Reply #7 on: March 17, 2017, 09:59:40 PM »
Cornstarch is lighter than Talc, and it is hard to find Talc that does not have some oil in it used as "Baby Powder" (the oil can screw-up the rest of your finish). Also, cornstarch is cheaper or can be swiped from the kitchen in quantities the "little woman" will never notice! A win-win in my book.

In an ancient article by Richard Miller on glider wing finish, he suggested a rubdown with powder before the first coat of dope to get the pores as filled as possible for light weight. Pack the pores as much as possible, then seal them in. He set a National Record that stood for over 30 years, but what the heck could he know?  LL~
Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

Offline Avaiojet

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Re: Dope. Filling the grain or filling the weave?
« Reply #8 on: March 18, 2017, 06:35:48 AM »
Craig!

Have you been off planet? Glad you're back.

Boy, have you got some catching up to do.  LL~ LL~ LL~

Charles
Trump Derangement Syndrome. TDS. 
Avaiojet Derangement Syndrome. ADS.
Amazing how ignorance can get in the way of the learning process.
If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot. "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten. "No amount of evidence will ever persuade an idiot."- Mark Twain. I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.   Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Offline Randy Powell

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Re: Dope. Filling the grain or filling the weave?
« Reply #9 on: March 18, 2017, 07:05:58 PM »
I prefer to just use dope. Keep putting on coats until it filled then sand and sand until it's flat and mostly off. It's lighter than using filler.
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