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I have two of the same old blow molds. Both need major repair. On one, its left side has a large piece missing. On the other, a large side of the right is missing. I am thinking about sacrificing one to make the other nicer. It would involve cutting about a 10 inch piece off the one and then soldering it onto the other. I know about the soldering... has anyone ever cut a blow mold like this? What tool do you recommend? Thanks.

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  • 4 months later...
On 3/29/2020 at 8:18 AM, Light in the Dark said:

I have two of the same old blow molds. Both need major repair. On one, its left side has a large piece missing. On the other, a large side of the right is missing. I am thinking about sacrificing one to make the other nicer. It would involve cutting about a 10 inch piece off the one and then soldering it onto the other. I know about the soldering... has anyone ever cut a blow mold like this? What tool do you recommend? Thanks.

You could cut it with a jigsaw.  I have cut a plastic barrel (55 gallon drum) with a jigsaw.  It's hard to speculate on exactly what method would be best without actually seeing it.  The barrel was about a quarter of an inch thick.  Since a blowmold is substantially thinner a jigsaw may be overkill.  It would be possible to cut a blowmold with a utility knife but that could go wrong in multiple ways many of which involve bodily injury.  It really depends on how thick the plastic is on these particular 'molds.

Being somewhat of a perfectionist it pains me to say this but keep in mind that your repair doesn't have to be "perfect" since it will be viewed from a distance.  If you cut the "donor" section larger than the "hole" you are trying to patch so that it overlaps by an inch or so you will then have several options on how to fasten it (small screws, glue, etc).  I was going to post some thoughts on plastic "welding" but I just read your post again.  I thought you said you didn't know about soldering but now I see that you said the opposite.  In any case I think that making the patch oversized is key.  If you can post pictures of the 2 'molds maybe some of the other folks on here will have some ideas.

TED 

P.S.  Making one good 'mold from 2 broken up ones is great but I was just thinking that (depending on the damage) it might be possible to cut patches from plastic jugs or something similar and save them both.

Edited by TED
to supersize a patch!
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A new box knife might work. Don't push to hard. You use a saw and you end up losing material because of the width of the blade and the seam wont line up perfectly, if you don't care about that then any kind of saw will work. A Dremel tool will work to, they have small cut off wheels for them that are pretty thin so you wouldn't lose so much material.

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Thanks guys. I will keep thinking about it. I ended up using some plastic milk carton to replace missing pieces for now. I couldn't bring myself to sacrifice one yet! Good ideas on the tools compared to the thickness and loss potential. Thanks for the tips.

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2 hours ago, Light in the Dark said:

Old Noel lantern municipal. It is double sided so the right face of the front side and the left side of the back piece were pretty messed up. Old, brittle plastic from the 60s.

Just curious......Is it the Noel Lantern shown in the pic?

 

Screenshot_2020-08-29-15-03-52_kindlephoto-80219003.png

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Yes, but not that exact one. The person who owns that one wouldn't sell it to me, but contacted me a year later when she saw one listed on Mercari! So thoughtful... it is my grail piece. Just wish the condition was better, but am grateful just to have one at all.

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16 minutes ago, Light in the Dark said:

Yes, but not that exact one. The person who owns that one wouldn't sell it to me, but contacted me a year later when she saw one listed on Mercari! So thoughtful... it is my grail piece. Just wish the condition was better, but am grateful just to have one at all.

I hope she sells it to you.  It's a wonderful item.  I don't collect any municipals, but for some reason this Noel Lantern sticks in my memory.  Maybe it's the colors, especially that light pink color.  :)

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