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  #21  
Old 06-16-2020, 09:34 AM
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ghrocketman ghrocketman is offline
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I generally do NOT use primer on plastic nose cones If I finish them with Hobby Store Enamel. That stuff sticks fine with just a light Scotch Brite scuff.
If I finish them with Lacquer/Dope I prime in order to prevent the Lacquer/Dope from crazing the plastic. Despite the many rumors/falsehoods, one can finish plastic parts with Lacquer if one does it properly. Primer and light multiple coats are key.
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  #22  
Old 06-16-2020, 10:02 AM
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LeeR LeeR is offline
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Quote:
Originally Posted by hcmbanjo
In addition to the white Tamiya filler, I've had great luck seam filling the plastic seams with the cheap, medium CA from the Dollar Tree store.

http://modelrocketbuilding.blogspot...-nose-cone.html

It stays on the plastic and sands glass smooth.


Ever since I read this suggestion on Chris’ blog, I’ve used the cheap Dollar Store CA (2 little bottles for $1), with great results. On deep or irregular seams, it usually takes a second application. You definitely want to sand the CA before it sets up — I typically wait an hour. This point cannot be emphasized enough! If you wait until the CA fully cures, you’ll have a terrible time sanding it!
Finally, I use Tamiya Surface Primer as my primer on plastic parts. It has no fillers, so you don’t end up blurring any molded details a part may have. I’ve never had issues with it not bonding well to any plastic.
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  #23  
Old 06-16-2020, 10:56 AM
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tbzep tbzep is offline
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Quote:
Originally Posted by ghrocketman
Despite the many rumors/falsehoods, one can finish plastic parts with Lacquer if one does it properly. Primer and light multiple coats are key.

I sure hope so cause I use lacquer primer pretty much exclusively.
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  #24  
Old 06-17-2020, 08:49 AM
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ghrocketman ghrocketman is offline
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I think one has problems with Lacquer/Dope on plastic when it gets coated with WAY too heavy coats in attempt to finish with one/two quick coats.
You can get away with that using Enamel, but it won't work with Dope.
Dope/Lacquer when applied properly results in a much deeper gloss finish than enamel.
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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL
, if you have to ask what is "NORMAL" , you probably aren't !

Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
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  #25  
Old 06-20-2020, 07:17 AM
PaulK PaulK is offline
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Scrape with hobby knife, #11 Excel blade (made in the US, xacto quality sucks), sand with 320, fill with squadron putty, sand, prime, sand, fill, repeat. Less effort if there's a good chance it won't come back.
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