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  #1  
Old 07-14-2022, 06:25 PM
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SeanB SeanB is offline
 
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Location: Colorado Springs
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Default Pinhole Filler

Looking for a quick fix to delete some remaining pinholes in wheel pants, fairings. Filler primer was applied already. Have these products on hand. Purple is acrylic based, Bondo is polyester. Recommendations? Thanks!
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  #2  
Old 07-14-2022, 06:44 PM
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wirejock wirejock is offline
 
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Default Bondo

I use the Bondo. Dries super fast.
I prefer Dan's method to finish fiberglass. Very few imperfections to fix.
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  #3  
Old 07-14-2022, 10:09 PM
Stewbronco Stewbronco is offline
 
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Default DAN'S method

Please share ......I could use a less work method for fibreglass
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  #4  
Old 07-15-2022, 06:03 AM
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DanH DanH is offline
 
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Default

Quote:
Originally Posted by SeanB View Post
Looking for a quick fix to delete some remaining pinholes in wheel pants, fairings. Filler primer was applied already. Have these products on hand. Purple is acrylic based, Bondo is polyester. Recommendations? Thanks!
Sean, either is fine, with a caveat. Squeegee them into the pinhole with some force. When when cured, sand off all trace, leaving only the filler down in the pinhole.

You mentioned "filler primer applied already". What product did you use?

Quote:
Originally Posted by Stewbronco View Post
Please share ......I could use a less work method for fibreglass
Not "Dan's method". Sealing the surface with epoxy skim coats has been around for quite a while now. It's usually attributed to Cory Bird, as seen on his awesome scratch built airplane he called Symmetry (below). Very common among composite builders, with examples on the web.

I'm not going to call it "less work", as it involves block sanding the entire surface after the epoxy skim coats are cured. That said, when done correctly there will be little else to do prior to primer, primer surfacer (if desired), and paint. And it's bulletproof; epoxy on epoxy, no mix and match chemistry under your paint. Remember the Chinese menu..."Cheap, fast, good, pick any two."

Examples in posts 15 and 68, and an epoxy shelled mold form in post 69:

https://vansairforce.net/community/s...ad.php?t=22931
.
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  #5  
Old 07-15-2022, 06:51 AM
lr172 lr172 is offline
 
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Quote:
Originally Posted by SeanB View Post
Looking for a quick fix to delete some remaining pinholes in wheel pants, fairings. Filler primer was applied already. Have these products on hand. Purple is acrylic based, Bondo is polyester. Recommendations? Thanks!
NEVER, EVER use the red, one part Bondo glazing stuff. It will create serious problems after paint. It is from the lacquer paint days and only works with lacquer paint systems. ONLY use two part fillers. Bondo makes both the red stuff and the polyester with activator (which is ok to use) in that tube size, so use caution.
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Last edited by lr172 : 07-15-2022 at 06:55 AM.
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  #6  
Old 07-15-2022, 07:05 AM
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Quote:
Originally Posted by lr172 View Post
NEVER, EVER use the red, one part Bondo glazing stuff. It will create serious problems after paint. It is from the lacquer paint days and only works with lacquer paint systems.
See the previous caveat. Not a problem if all of it is sanded away, leaving only the tiny bit down in the pinhole.

Used as a glaze, i.e for surface build? Yes, bad idea.
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  #7  
Old 07-15-2022, 12:37 PM
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Thanks all for your replies. For a friend's plane and he used rattle can Duplicolor Filler Primer for now. He has a paint date later this year.
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  #8  
Old 07-15-2022, 12:58 PM
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Quote:
Originally Posted by SeanB View Post
Thanks all for your replies. For a friend's plane and he used rattle can Duplicolor Filler Primer for now. He has a paint date later this year.
Tell him the rattle can primer is a pointless waste of time and money. If the painter is any good, he will sand it off and start over with a two-part primer.
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  #9  
Old 07-15-2022, 01:13 PM
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Laird Laird is offline
 
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Quote:
Originally Posted by DanH View Post
It's usually attributed to Cory Bird, as seen on his awesome scratch built airplane he called Symmetry (below).
Cory's airplane is the most perfectly finished I've ever seen. Just flawless.
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  #10  
Old 07-15-2022, 03:48 PM
Bandera Bandera is offline
 
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Quote:
Originally Posted by DanH View Post
See the previous caveat. Not a problem if all of it is sanded away, leaving only the tiny bit down in the pinhole.

Used as a glaze, i.e for surface build? Yes, bad idea.
I use a glaze called Nitro-Stan. Itís a lacquer based red putty. The smaller the spot the better. If you need to fill something, use body filler or a 2 part glaze like Evercoat 417. The red putty is for when you just have a few pinholes left. If you have too big a spot of red putty, it never completely dries. It just skins over. After you paint over it, you get a blister right there.
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