Using weight and time to flatten out bowl warp

Hey all, I have a recent GZ pressing that has a classic bowl warp. I've been thru all the heat methods over the years, and it's never worked really well for me. I was wondering ing weights long term.

I can get two sheets of glass (probably 14"x14"), and can park some weight on it for whatever time. I have some adequate weight options, and the whole experiment can just sit in my listening room. I'm thinking it might need 6 months or so? This is complete speculation. Would it actually flatten? I know records WILL warp over time if you have them haphazardly stored. Has anyone done this before? Am I daft? Don't answer that last one.

Also, should the record just be naked in there, or should it be in a high end sleeve? Thanks for any input on the idea.

I am currently doing that experiment. I found round fairly heavy glass pieces and have two records going. At first, I put a small amount of weight on each one (about a pound) as I did not want to overdo the pressure in the beginning. After a couple of months, I checked the records and since there was still a warp, I increased the weight. More month ongoing.
I'm beginning to think that this is a very slow method and that I probably need to increase the weight again.

Thanks ross.jones. I was planning on finding some 1/4" or so glass. I have two metal boxes full of movie film, about 40 pounds each. I was planning to use one or both of those. I don't see how there could really be TOO much weight. Flat is flat.

Did you leave the records in sleeves, or are they "naked"? Thanks for your interest.

Being shellac and if the warp is significant, I would not want to overdo the pressure. Though I believe most warps are not that bad. For vinyl, I would agree that they can withstand the greater pressure. I just put the record between the two glass pieces (naked). I don't see any reason for having a sleeve on.
I'm about ready to try the 200 degree C oven for 5 minutes. Shellac records.

I'm close to trying it. Just have to scrounge up some glass and set it up. I have a tiny wooden table to use, set up in the corner.

The scientist in me is curious.

I paid $250 for a Record Pi and have successfully fixed dish warps and edge warps. I had 1 that laid flat was 1.5" off the table on the edge. I ran a few times and was 99.9999% flat and the music sounded fine when played. So much easier than everything above. I'm able to control it away from home and set a timer to turn off etc. I wasn't sure about spending $250 but glad I did. Knowing what I know now I'd pay $400.

From my experience weight only helps a little, maybe a 10-15% improvement. You really need a little heat to be able to fix a warp.

my mom weighs 400lbs, maybe just put in her recliner and she can sit on them, heat and weight

Uhm. No. I would however recommend you use a tool engineered to fix warped records like the Orb: https://www.orb-audio.jp/english/df01iaplus.html

Don't be a caveman playing with rocks, use a bloody tool yah upright ape!

Well, thanks guys. I'm well aware of the little gizmos to fix warps. A local dealer for years was doing them for $8 until the warp hurricane we see now occurred. I'm interested in low-tech without consuming another electronic thingie. Money is not the issue here at all. Less is more IMHO.

boinks, you mentioned an actual trial with minimum improvement. How much weight and how much time? I got both! Thanks~

I think it was about 50lbs over 2 months. I didn't try anymore after that.

The benefit of a friend buying a Record Pi, haha.

So ... using weight and time to flatten out bowl warp works?

Some interesting reading on this subject here:
https://www.soundfountain.com/amb/warpedvinylcorrection.html

Thanks for the relevant article, chiz.

I'm still considering the idea just out of general interest, BUT I might just chuck the record and get a new one. Frankly much easier.