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Re: (ET) How much POR-15?
On 6/17/06, David Roden <etpost drmm net> wrote:
I'm going to try this stuff (POR-15) on the underside of the 36" mower
for my New Idea rider. It now has spray-on appliance "epoxy" enamel on it
(applied a couple of years ago) and the rust is bubbling back through.
I plan to have the underside sandblasted to remove the old paint and rust.
>From what I read on the POR-15 website it appears that all I have to do is
wipe off the dust and brush the POR-15 onto the bare metal. (Right?)
I don't plan to paint the top of the deck. It's scratched up and it's not
pretty but I don't really care; that's just appearance. This is supposed
be a working machine, not one that I take to shows.
What I want to know is, how much POR-15 should I order? There are some
pretty vorpal pits in the steel, so I'll want to apply 2 or 3 coats, and
paint will be doing some filling, so the stated coverage of 12 ft^2 per 4oz
is probably overly optimistic.
The $25 pint is a much better deal per unit of measure than the six-pack of
tiny 4oz cans - but if I buy a pint, will I use it all? It appears that
shelf life once the can is opened is pretty poor.
Also, how does POR-15 stand up under decks? Should I consider a 2-part
topcoat for durability?
I was pleased to discover that when I coated the underside (only) of
my EGT-150 mid-mount deck I used up exactly one 4 oz. can. I applied
two thin coats as recommended.
As I reported earlier, I neglected to clean off the accumulated grass
from my deck's underside. I t was very thick, probably from that time
I *had* to mow even though the grass was pretty wet. Sure enough,
after cleaning the schmutz out of there I found plenty of little rust
pits in the POR-15.
When I had mine sandblasted it came back with some rust still present.
I assumed that wouldn't be a problem because POR-15 is supposed to
encapsulate and adhere to rust just fine. If I had it to do over
(which is probably coming) I would have it re-blasted or take a
grinder to it until it's *really* free of rust. The POR-15 folks say
it'll adhere to bare metal just fine. Also you don't want to simply
wipe it off, I used their etchant/prep to make sure there are no
contaminants on the metal.