Marine varnish

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HJ75 Rob
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Marine varnish

Unread post by HJ75 Rob » January 26th, 2015, 7:08 pm

Someone may have the answer, I thought marine varnish was just a better quality varnish with some UV stabiliser in it.
Then the label says "Not suitable for inside surfaces". I am going to use it on a table which will be outside only sometimes but inside mostly. Some of the reason for using it is that I already have it and the notion that it may be harder wearing.
So what is the go with it, should I use it or not ?

Cheers
Rob

Peter Aawen
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Re: Marine varnish

Unread post by Peter Aawen » January 26th, 2015, 7:19 pm

Some of the additives they use to make (some) marine varnishes work better & last longer in the harsh marine/outside environment really aren't the sorts of additives you want to have inside or anywhere someone could eat food off of or a kid might suck on them.... Some of the mould & 'anti-fouling' stuff that is in some marine varnishes is pretty potent stuff, & even just the fumes from the dried & already cured paint on something stored in a room (reasonably ventilated too) is enough to make some people sick!! :eek:

If you want to keep the table inside in a living area most of its life, I wouldn't recommend a marine varnish that has "Not suitable for inside surfaces" stamped on it unless you can find out exactly why it's not suitable & that isn't anything likely to give you concern! There are quite a few 'marine' varnishes that are perfectly OK for both inside & out, and for eating off too, isn't your health or the health of your family worth whatever it costs to get/use one of them?? ;)
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HJ75 Rob
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Re: Marine varnish

Unread post by HJ75 Rob » January 26th, 2015, 7:28 pm

Thanks Peter for the quick reply, you make sense. Now I don't think it's suitable , keep it for the outside only.

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Rob

nilla60
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Re: Marine varnish

Unread post by nilla60 » January 26th, 2015, 7:39 pm

"Marine varnish" is not that great if left exposed. I put down marine ply on top of the thwarts in my tinny and laquered it with marine varnish. It burned off in the Aussie sun in only a few months.

I also did the oars and other stuff that I keep in the shed and they are fine as they are only out in the sun when I'm using the boat.

Any sort of timber table top will struggle if left entirely exposed. Even a little shelter makes a big difference. If you want to go fully exposed, look at what you local council uses at picnic sites. It'll either be heavy hardwood left pretty much natural or painted with a heavy gloss.

HJ75 Rob
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Re: Marine varnish

Unread post by HJ75 Rob » January 27th, 2015, 12:29 pm

Nilla , sort of agree with you, the marine varnish I have was got to do my boat but haven't got around to it yet, it's made of aircraft ply left over from the WW2 made in 1948 , the ply is perfect but the varnish on the outside is horrible. Also I have to make a new windscreen to replace the modern replacement of the 70s.its a Chriscraft desighn made by my father. My family has used it from ever since I can rember, my father gave it to me some 20 years ago, now it's due for some TLC. The motor an EVenrude 40 was got in 1960 to replace the first one. It runs well and reliable.
Eneyway I will keep the marine varnish for the boat.

Cheers
Rob

nilla60
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Re: Marine varnish

Unread post by nilla60 » January 27th, 2015, 3:56 pm

Yeah, classic timber cruiser needs a classic look, even if it means a bit of elbow grease.

I expect that buying something from s specialist might get a better result than what I picked up at Bunnings.

HJ75 Rob
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Re: Marine varnish

Unread post by HJ75 Rob » January 27th, 2015, 4:03 pm

I will look into a better type of marine varnish, meanwhile there is a lot of sanding to do, time to bite the bullet now that other projects are finished, never stops but I love it.

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Rob

Heisenberg
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Re: Marine varnish

Unread post by Heisenberg » February 1st, 2015, 11:04 am

Peter Aawen wrote:Some of the additives they use to make (some) marine varnishes work better & last longer in the harsh marine/outside environment really aren't the sorts of additives you want to have inside or anywhere someone could eat food off of or a kid might suck on them.... Some of the mould & 'anti-fouling' stuff that is in some marine varnishes is pretty potent stuff, & even just the fumes from the dried & already cured paint on something stored in a room (reasonably ventilated too) is enough to make some people sick!! :eek:
Highly unlikely.

If you tell me the brand of product I'll chase up the MSDS and try to figure out why they don't recommend for indoor use.

Edit: I've had a look at a couple of products, and it looks like it's just regular varnish with high levels of UV stabiliser:

A super high gloss finish with maximum levels of U/V inhibitors and stabilisers for areas of extreme exposure. Ideal for panelling, doors, hand rails and general varnish work. Not suitable for floors or traffic surfaces. (Weatherfast).

No reason that I can see why you shouldn't use it indoors

HJ75 Rob
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Re: Marine varnish

Unread post by HJ75 Rob » February 1st, 2015, 4:35 pm

It's Wattle Marine Varnish.
The MSDS may explain why.

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Rob

Heisenberg
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Re: Marine varnish

Unread post by Heisenberg » February 4th, 2015, 12:10 am

I had a look at the MSDS and can't see anything particularly threatening, which they'd be legally obliged to disclose if it was there.

All I can suggest is that as it's designed for outdoor use it's packed with volatile and flammable solvents that could potentially present a hazard if used indoors. It's still pretty unlikely though - unless you were painting a tiny room and decided to hold an indoor BBQ you'd never reach the LEL (Lower Explosive Limit) for the flammable solvents. Also, it contains a bit of benzene which is carcinogenic, but only a bit (less than 0.1%), so that may be another issue from a safety point of view

More than anything else it's probably just a comment on how the paint market has changed - water based paints now have very sophisticated formulas and have all but replaced solvent-based products for indoor use, as people no longer want to tolerate "chemical" smells.

Bottom line is that it's fine to use indoors if you wish - just make sure the room is well-ventilated.

HJ75 Rob
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Re: Marine varnish

Unread post by HJ75 Rob » February 4th, 2015, 4:30 pm

Thought that was the case, only thing I have against marine varnish is it's very slow to cure ca pared to indoor varnish.
Eneyway the table is now varnished with indoor varnish , this leaves the marine for the boat.
Thanks for that,
Cheers
Rob

Heisenberg
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Re: Marine varnish

Unread post by Heisenberg » February 7th, 2015, 9:04 am

Yes that makes sense. No doubt it has been formulated to be reliant on UV curing - that might be part of the "not suitable for indoors" comment

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