Can I re-coat a fiberglass mast?

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Newtothis
Newtothis
19 posts
19 posts
14 Jul 2009 8:40pm
Hi, I have just bought two second hand windsurfer outfits, and couldnt stop itching!

I just noticed that one of the masts has no coating around it (or it has worn down) and all the little glass fibers are flaking off as I touch it.

This cant be right can it? the other mast I have is very smooth the full length.

Many thanks
Jimmy
decrepit
decrepit
WA
12888 posts
WA, 12888 posts
14 Jul 2009 9:02pm
Yep, I've had a mast like that, not nice on your hands either.
I threw mine away, but you should be able to paint a coat of resin over it with reasonable results.
It's just a bit difficult to get a finish that is smooth and thick enough.
Not sure what causes it, maybe UV degradation of the resin, or maybe the original lay up was a bit dry, leaving unwet out fibres just below the surface. So I've no idea how structurally sound the mast is, sould just snap on you, without much reason.
Windxtasy
Windxtasy
WA
4019 posts
WA, 4019 posts
14 Jul 2009 9:08pm
I had a mast that went like that after a few years use. I think the cause is UV deterioration. I think I tried painting it with something (can't remember what) but that peeled off too.
It seemed still quite structurally sound but the fibreglass splinters were annoying so I tossed it out. The splinters get into the luff sleeves of your sails as well as your fingers.
Mark _australia
Mark _australia
WA
23721 posts
WA, 23721 posts
14 Jul 2009 9:14pm
Yes Old masts do thata s the gelcoat has worn off.

Resin usually flakes off fairly quickly if you paint in on, as does normal paint.

Get a panel beater (car spraypainter) to paint it with 2 pac clear with lots of flexative additive in it so it won't crack.

However consider that the mast is not worth much if it is that old, so if they are going to charge more than $30 or a carton then it may be worth a new (2nd hand) mast at $100

greenleader
greenleader
QLD
5283 posts
QLD, 5283 posts
15 Jul 2009 12:46am
IMS

itchy mast syndrome is easily cured.

hose off mast thoroughly with detergent and scrubbing brush,
sun dry thoroughly,
spray with clear spray can car paint from el cheapo car bogan shop,
let dry for a day or two,
use washing gloves and a tub of water and some 240 grit wet and dry sandpaper and treat that mast to a gentle rubbing to remove the protruding fibres.
dry again,
spray with new can of k mart auto clear whilst inhaling fumes.

woooh job done.

Newtothis
Newtothis
19 posts
19 posts
14 Jul 2009 10:51pm
Thats great, thanks for the responses!

Im not sure it will snap though, as a newbie, anything stronger than a breeze and Im staying on terra firma!

The other mast is a Sportex EPO 4.85m (made in Germany) it is much better condition.

I will try to flush out the glass from the luff sleeves before using it again.

thanks again guys
Jimmy
oldie
oldie
VIC
356 posts
VIC, 356 posts
15 Jul 2009 2:32am
Painted such a mast with marine varnish 6 months ago and it looked nice.
I note that there is now not a trace of the stuff left on the mast.
A flexible coating might make it difficult to get sails on and off.
Toss it, I say!
555
555
892 posts
555 555
892 posts
15 Jul 2009 5:45am
Greenleader has the answer..

I bought a secondhand mast three years ago and it was NASTY with prickles. I wet and dry sanded it all over with 240 grit, washed it down and let it dry out over night, then gave it three coats from a decent quality clear 'enamel' spray can with a light rub down between coats.

I'm going to have to give it another coat soon, but given the amount of use it's had in the meantime it's been a great solution.

My local repair guru says that the splinters are a combination of UV damage, and water ingress into the outer fibres over time. Salt water is particularly bad as the salt absorbed builds up over time and forces the splinters out.

Another benefit of a dose of spray paint is that a slippery smooth gloss finished mast is really easy to slide out of a wet mast sleeve without crinkling the sail.

It does take a while to stop being stabbed by small shards left in the mast sleeve - you just have to crash more in the meantime!
club309
club309
QLD
66 posts
QLD, 66 posts
15 Jul 2009 10:20am
the best stuff to use would probably be a 2 part polyurethane. however the expense of this paint probably wouldn't be worth it for an old fibreglass mast. i think greenleaders method will be best
Newtothis
Newtothis
19 posts
19 posts
15 Jul 2009 3:43pm
Sounds like the cheap clear spray then,

I will let you know how I get on.


thanks again

Jimmy
landyacht
landyacht
WA
5921 posts
WA, 5921 posts
15 Jul 2009 6:45pm
Old fibreglassers repaair. I mix some talc in with the resin and some fast hardener just homebrand scentd stuff.
paint on and when hardened sand back with wet and dry . it leaves a smooth talc enhanced finish that is great for your mast pocket and is hard enough that it can take a bit of roof rack abuse
This has been standard procedure for old masts on UV happy salt lakes for a couple of years now
greenleader
greenleader
QLD
5283 posts
QLD, 5283 posts
16 Jul 2009 12:21am
yes but a coat of resin and cement powder is heaps heavier than a coat of acrylic spray in windsurfing terms. think waterstarting, uphauling etc.
but yeah, nothing beats a filler resin and talcum powder coat for smooth insertion if thats really important to you above all else.
Newtothis
Newtothis
19 posts
19 posts
16 Jul 2009 2:55pm
landyacht said...

I mix some talc in with the resin and some fast hardener just homebrand scentd stuff.




Thanks for this option, please could you give an indication of mix ratio.

many thanks
Jimmy
landyacht
landyacht
WA
5921 posts
WA, 5921 posts
16 Jul 2009 8:51pm
Sorry if I misled.
I only add enough talc to lightly thicken or discolour the resin . I still brush it on, preferably onto the still rough surface rather than a sanded one. less than 70gms? of resin would be plenty..
when the fumes vent off it would probably weigh that with the talc.
when sanded you can almost see the old mast surface underneath
If I have a mast that needs doing I just leave it out till Im glassing something else, then mix in a bit of talc to any leftover resin
Mark _australia
Mark _australia
WA
23721 posts
WA, 23721 posts
16 Jul 2009 9:41pm
I ran out of Qcell once and used talc. The board smelled like Lynx even after being painted. Never again........the chicks followed me everywhere on the water

greenleader
greenleader
QLD
5283 posts
QLD, 5283 posts
16 Jul 2009 11:51pm
both resin and acrylic versions are solid methods with possibly either worthy of a gold cup in rescuing a flexy spaggetti stick of a mast to rig a sail like a floppy piece of rag with 6 knots of wind range.



Newtothis
Newtothis
19 posts
19 posts
17 Jul 2009 4:31am
landyacht said...

Sorry if I misled.



Not misled, just never done before so I needed to check.

Like the idea of the Lynx effect in Mark _australia's post, if only!


thanks everyone, thanks for all advice and help, its much appreciated.

Jimmy
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