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Pin Holes

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Andy Joyce25/02/2020 17:12:53
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178 forum posts
30 photos

Being doing some balsa bashing to knock up a Bird of Time. Having completed a modified centre wing section to allow each wing to plug directly into the fuselage I am left with the 1/16" wing sheeting peppered with pin holes. In the old days I would make up a paste of balsa sandings mixed with balsa glue to fill these. So what is the modern replacement to this approach as the last filler I purchased from my local model shop was rubbish? Have tried Wilco's light weight filler on Depron but its a bit of a mess on balsa.

Martin Harris25/02/2020 17:37:01
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9154 forum posts
229 photos

Unless you use 6" nails, pin holes seem to disappear when you give the surface a light sanding...

Engine Doctor25/02/2020 17:39:34
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2402 forum posts
31 photos

Try some water based filler like polyfiller or polyfiller light . Sands really easy once dried and adheres well There are also many lightweight fillers on sale at Diy stores . If area is prone to twisting try some Ronseal Woodfill. Its a two part filler that sets in about 10 minutes a little heavier than the light stuff but wont shrink or fall out , its easy to sand and comes in white or beige .

Andy Joyce25/02/2020 17:47:07
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178 forum posts
30 photos
Posted by Martin Harris on 25/02/2020 17:37:01:

Unless you use 6" nails, pin holes seem to disappear when you give the surface a light sanding...

Martin don't think these will go away with sanding. Pin shown is 30mm long.dsc01121 (medium).jpg

Martin Harris25/02/2020 17:54:10
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9154 forum posts
229 photos

In which case, any of the lightweight fillers should do the job. If there's no model shop handy, try Screwfix.

Andy Joyce25/02/2020 18:12:28
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178 forum posts
30 photos

As stated I find the white light weight fillers don't really work as they done seem to adhere well to wood or balsa.

Peter Miller25/02/2020 18:21:44
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10717 forum posts
1254 photos
10 articles
Posted by Andy Joyce on 25/02/2020 18:12:28:

As stated I find the white light weight fillers don't really work as they done seem to adhere well to wood or balsa.

I doubt if that is a problem.He doesn't want a coating on the outside. and the filler is going to be IN the holes.

McG 696925/02/2020 18:27:54
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3008 forum posts
1137 photos

Hi Andy,

... just mix your lightweight filler with a few drops of diluted PVA (20-25 %)...

... perfect adhesion to whatever wood you're using and really easy to sand when dry...

... if your model is to be covered with 'translucent' material, just add half a drop of artist acrylic 'Burnt Umber' to get the shade of balsa...

Hope this helps

Cheers

Chris

jrman25/02/2020 18:36:57
365 forum posts
3 photos

As the holes have been made by pins no wood has been removed, just compressed. Try a drop of saliva over each hole to expand the balsa. I know it sounds strange but it works.

Martian25/02/2020 18:38:17
2365 forum posts
1108 photos

+1 for Chris,s suggestion it,s what I do and it,s very effective and sands well

Tim A25/02/2020 18:45:24
224 forum posts
13 photos

I have tried lots of fillers until I used this https://www.reddevil.com/index.php?l=product_detail&p=913 which I had on the shelf for home repairs. Wouldn't use anything else now.

Don Fry25/02/2020 18:54:35
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4557 forum posts
54 photos

You built it. It's entitled to holes. You might notice . No one else will.

Rob Fairweather 125/02/2020 21:18:07
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83 forum posts
5 photos

A +1 for the saliva/spit solution , been using that method since 1966.

Engine Doctor26/02/2020 09:23:45
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2402 forum posts
31 photos
Posted by Rob Fairweather 1 on 25/02/2020 21:18:07:

A +1 for the saliva/spit solution , been using that method since 1966.

Very interesting . have used it on dents in balsa but never tried it on pinholes . Will try that on next build .

Gary Murphy 126/02/2020 09:55:52
406 forum posts
14 photos

I get a very small fine detail paintbrush and put a drop of water on each hole. the wood sweels around the hole and closes. if what I read about wood is correct the fibres then mesh again.

Andy Joyce26/02/2020 17:12:11
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178 forum posts
30 photos

Well just tried the spit and rub and it does seem to work! Will now let it dry and give it a light sand again.

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