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Old 19 July 2010, 18:00   #1
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Polymarine Hypalon Adhesive

Was adding some wear patches today with Polymarine Hypalon Adhesive, followed the instructions, half the 250ml tin with half the 10ml activator, mixed well. Problem was the glue was almost off by the time I'd applied it. First coat on the four patches fine but by the time I'd got to the forth prepped area on the sponson, it was going off. I was working bloody fast by the way as I could tell it was going off way too fast. Anyone experienced this before? It says on the tin that it will last 4 hours after it's mixed, I'd say closer to 20 minutes. I've got a tin of Bostick on order for the rest Only thing I could think of was that it was quite muggy today, but I'm open to suggestions.

free
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Old 19 July 2010, 18:14   #2
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Quote:
Originally Posted by free View Post
Was adding some wear patches today with Polymarine Hypalon Adhesive, followed the instructions, half the 250ml tin with half the 10ml activator, mixed well. Problem was the glue was almost off by the time I'd applied it. First coat on the four patches fine but by the time I'd got to the forth prepped area on the sponson, it was going off. I was working bloody fast by the way as I could tell it was going off way too fast. Anyone experienced this before? It says on the tin that it will last 4 hours after it's mixed, I'd say closer to 20 minutes. I've got a tin of Bostick on order for the rest Only thing I could think of was that it was quite muggy today, but I'm open to suggestions.

free
I've used it. It does start to go off quite quickly, especially if there's a wind, which evaporates the solvent very quickly.

I usually mix very small quantities, measuring them for proportion by using a couple of plastic syringes I got from the local chandlers, who sell them for exactly that purpose.

Excellent results though. It don't half stick well.
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Old 19 July 2010, 18:27   #3
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I know this sounds a little patronising - sorry!

Was the area you were coating in direct sunlight?

I have not ever used the Polymarine stuff, one day I will I am sure.

Normally humidity means you have to just buzz the area with a heat gun, so I really doubt that was your problem, to be honest where I am, today, I would not have needed to worry.

What size of area is it?
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Old 19 July 2010, 18:34   #4
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Sadly, I have used it quite a bit and yes it goes off quickly as said.
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Old 19 July 2010, 18:40   #5
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Actually, it was in the back of a garage, so completely out of sunlight, the temp I'm guessing was about 16-18 degrees. It certainly seemed to stick fine, just worried me that it went off so fast. After the second coat, the instructions were to wait for 5 minutes or until tacky, I literally put the brush down, checked with knuckle and there was no transfer.

Each patch was 31x17cm so not huge, I'm bloody glad that I guessed the quantity right or I'd have been doing more swearing than normal.

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Old 20 July 2010, 02:57   #6
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Actually, it was in the back of a garage, so completely out of sunlight, the temp I'm guessing was about 16-18 degrees. It certainly seemed to stick fine, just worried me that it went off so fast. After the second coat, the instructions were to wait for 5 minutes or until tacky, I literally put the brush down, checked with knuckle and there was no transfer.

Each patch was 31x17cm so not huge, I'm bloody glad that I guessed the quantity right or I'd have been doing more swearing than normal.

free
Sounds like it will probably be OK
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Old 20 July 2010, 04:42   #7
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4 hours means the pot life after its mixed, not after you apply it, it will stick for quite a while after the tack has gone off it,
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Old 20 July 2010, 12:44   #8
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Same with the Polymarine PVC glue, the second layer dries very, very fast. On the web page instructions mentioned that if it going off "gently warm the area ...." this maybe makes it sticky again. Dont know if this works with hypalon glue also.

Either its the strongan fabric or then the glue, but gluing the rowlocks was this time much more demanding with this combination than what have experienced with simmilar jobs on the previous PVC inflatable.
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Old 20 July 2010, 16:53   #9
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4 hours means the pot life after its mixed, not after you apply it, it will stick for quite a while after the tack has gone off it,
I read it that way too, but I can assure you it was seriously thick in the container by the time patch four was done, by that point I was scraping it on with the brush rather than painting it.

Seems to have worked though.

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Old 20 July 2010, 18:43   #10
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I read it that way too, but I can assure you it was seriously thick in the container by the time patch four was done, by that point I was scraping it on with the brush rather than painting it.

Seems to have worked though.

free
put a bit more thinners in and give it a stir, it goes on a little more evenly if you thin it a bit, toluene evaporates really fast
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