Lab Metal CRACKING WHY???

[the_powder_coating_master]

hey guys i have never used this Hi-Temp Lab metal $hit before and it is cracking after i take it out of my oven to sand it... WHY

This is how i did it:

1) Sand blast piece blow off dust and wipe with solvent.
2) Fill with Lab metal and let air dry for 24 hours.
3) Put it in the oven for 1 hour at a little under 200 degrees celcius.
4) Removed from oven and Sanded lab metal and refill with lab metal. And let air dry for 24 hours.
5) Put it in the oven for 1 hour at a little under 200 degrees celcius.
6) Removed to sand it and it has CRACKED

Too expensive $hit for this too happen.

[cdaeme]

I have never had luck with the Lab Metal and I have used over half a can. If it dont crack or flake back off then it outgases. I have had very good success with JB Weld it cures quickly and it's much easier to work with.

Jason

[Banditperformance]

Ya, my l;uck with Lab Metal isn't good either. I have been in contact with the manufacturer and they say that no oven time before acctual baking. Even after cured for 24 hrs. Basically, spread, wait 24 hrs, sand and spread more. I just redid a Lab metal project with JB weld. And It takes about the same time to cure, 15 hrs for full cure. But it's working time is alot longer than Lab Metal. Meaning, you have more time to get it smooth so you have to sand less. JB weld is also tougher to sand than Lab Metal. So, smooth it out nicely before it cures=less work after

[jtagger19]

JB has been my friend for years.
if you are in a hurry
you can dry JB weld in the oven
I do for 10-15 mins at powder cure temp.
don't make it thicker than 1/8 or it will crack.

[FiReBReTHa]

Originally Posted by jtagger19

JB has been my friend for years.
if you are in a hurry
you can dry JB weld in the oven
I do for 10-15 mins at powder cure temp.
don't make it thicker than 1/8 or it will crack.

so you can coat jbweld??


if yes, another yeason to love jb weld.

[beldenhillpc]

Anybody tried this yet? http://www.thermobond3.com/ I won a free sample last month,haven't had a chance to try it!

[Banditperformance]

Originally Posted by FiReBReTHa

so you can coat jbweld??


if yes, another yeason to love jb weld.

YUP :up:

[cdaeme]

Originally Posted by beldenhillpc

Anybody tried this yet? http://www.thermobond3.com/ I won a free sample last month,haven't had a chance to try it!

I got a sample of it . I works well for filling small voids or scratches. If you read the instructions it is not recommended that you sand or work it after curing it. So for me that limits its uses.

Jason

[the_powder_coating_master]

I brought lab metal and i was hopeing to use it as a filler similar to builders bog, but the $hit is watery as and it takes to long to build up thickness. I'm trying to find something that i can used to fill large dents and the likes. And i don't wanna have to wait two days before i can coat over it. In another forum some body mentioned a two part epoxy filler that can go up to 750 degrees. any body know what it is

[Harleydad]

Tiger Drylac has an epoxy repair kit. I've never used it, but it may be more workable than lab Metal. Can only be applied up to 2 mm thickness.
http://www.tigerdrylac.com/fileadmin...Repair_Kit.pdf