I don't think paint would dull a saw much, but I wouldn't be too
thrilled if someone used one of my good handsaws to cut through scrap
lumber, especially if there was any chance of hidden nails/staples/etc.
I'm really sorry to take sides here, but in my opinion, if this is his
tool, you should respect his wishes about how/when it's used, even if
they don't make sense to you. Of course if it's your tool and he sort
of adopted it and is borrowing space in your shop, then you can use
whatever you want however you want.
Again, just my opinion.
It depends... some paint has a lot of silica in it (basically fine sand)
that will speed the dulling of the saw. Whether cutting painted wood is
something to get upset about is a personal standards issue... Me personally,
I reserve a relatively low end circular saw blade for painted wood and keep
painted wood away from my good blades, hand saws, and jointer and planner
knives. Early on I put grooves in jointer knives when I edge jointed wood
with painted faces... one 4' board is all it took!
Assuming similar tools to my own set, I'd be upset that you'd used the
"good" saws without asking, and that you'd used a good saw for a job
that a crude saw could do just as well.
Paint isn't the issue.
It depends on what you mean by "paint" -- if you mean (perhaps) the
25-year aluminium oxide finish they put on hardwood flooring, then ya...someone
is likely to spaz about their hand-made dozuki being used on it.
I wouldn't think that cutting 'a' piece of wood with paint on it would
do much to dull a good saw.
That being said, when you own a really sharp tool, it is easy to get a
bit fanatical about keeping it really sharp. Once you start using
really sharp tools, you come to appreciate how much more enjoyable the
work is compared to using a not so sharp tool.
No, I very much doubt it. But nails will! But I keep three saws, one
like new, one for everyday use, and one for hacking about. They are
dead cheap these days.
I now keep my "best" saw out of the way, as a while back, wife
borrowed it to prune some trees !
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