cleaning up Galv iron

[Tonyz]

In the process of dismantling the 60'x49'x12' shed recently purchased for $5 grand. There are some sheetrs that need 'trimming' across the base due to rust infection........ whats a good way to cut these across and is there some type of paint that will adhere to aged gal sheets so that when an extension is added in colorbond it dont look like an attack of color blindness.

[RETIRED]

http://www.woodworkforums.com/showthread.php?t=76922 (http://www.woodworkforums.com/showthread.php?t=76922&highlight=corrugated+iron)

http://www.woodworkforums.com/showthread.php?t=32039

[RETIRED]

The second one is better.

[weisyboy]

you can buy paint for painting corigated iron.

an angle grinder is best for cutting it an 8"er works better than a 4"er and thin cutof wheels are best as the thick ones wear to fast.

[bsrlee]

According to my late father, a house painter for most of his life, the problem was in getting the paint to stick to NEW gal, not OLD gal. He used to etch the surface with weak acid, or recommend leaving it exposed to city weather for several months before attempting to paint it, then used an 'oil based' exterior paint - there used to be several on the market that claimed to be suitable for galvanised roofs, regular paint couldn't stand the regular baking plus expansion/contraction cycles.

[Tonyz]

Thanks ............the ole search button eh forgot all about it.

[Christopha]

NEVER use an angle grinder to cut Galv iron, Clourbond or Zincalume....

[weisyboy]

NEVER use an angle grinder to cut Galv iron, Clourbond or Zincalume....

so how do u cut it then.

[BobL]

NEVER use an angle grinder to cut Galv iron, Clourbond or Zincalume....

It would be more helpful if statements such as these could be backed up with reasons and an alternative cutting method provided.

The use of NEVER is a bit strong as well, since it it depends on the environmental conditions and any other helpful precautions you might take. I have sheets of corrugated I cut lengthwise with an angle grinder 20 years ago that have not rusted. They are on the edge of a roofline (ie not on a join), I used wet towels along both sides of the cutting line to stop the spray of sparks damaging the rest of the sheeting and I removed the bur with the same grinder and sprayed anti rust paint onto the edge. The edge is still as good as the other sheets. I would not do this on edges used in joints with other sheets but elsewhere it can be done satisfactorily. These days I use a thin kerf cutting wheel which further reduces the amount of sparking - for cutting elsewhere use a nibbler or plane old tin snips.

[mic-d]

so how do u cut it then.

that's what 's links are for:;

Cheers
Michael