gluvit second coat question

[cully]

I put a secnd coat of gluvit on the botom skidplate on my wood driftboat. The first coat dried in less than 12 hours. The second coat put on 48 hours after the first is still tacky after 36 hours. Anyone have experince with a second coat and dry time estimates? It's time to turn the woody over and get to it but what to do?

[Dan Christopher]

i just put coat-it on my boat today/...first coat put on at 2;00 hard as a rock by 4:00 second coat on at 4:00 hard as a rock bu 6:30..but this is coat-it not glove it. but i would think it yours would be hard by now...

how many gallons total did you use???

mine took 1 1/2

[cully]

Manwizzard, just a quart both times. Just on the skid plate. Roughly 4'x8' I'm wondering if i did not stir the two chemicals together long enough. Directions say add little container (hardener) to quart container of gluvit and stir for 3-4 minutes. I thought I did. Manwizzard, did you sand between coats? I did not. Should I have?

[chuck 'n' duck]

Cully:

Sanding would help the adhesion of the second coat, but not affect the drying time. My guess is that something went wrong in the combination of the resin and hardener. Either there was not enough hardener added, or it was a bad batch. I would give it another 24 hours.

CnD

[cully]

roger wilco

[Torchman]

Hey, Cully....
Hate to be the bearer of bad news.... :sick: Two part epoxy products do NOT "dry" in a conventional sense. Most DO generate their own "heat"...but if they do NOT "kick" you are generally left with an ugly mess!!!! So, what you are left with is a nightmare....plastic scrapers, and HOPEFULLY some kind of solvent to remove the rest!!!! Then, recoat.... :hoboy: I have used Gluvit in "other" applications...and always found it user friendly.....

[ssteelheadsteve]

For the best gluvit job

Do it when it is cold and allow about a week for a full cure.Scuff lightly with 40 grit and recoat. On metal boats fill the chine completely and let it harden.Latter add a top coat. This will make your boat almost as good as a glass boat untill you actually hit a solid rock that will bend your bottom and create a suction cup that will eventually make your metal boat a drag to row. On hot days reduce MKP by at least 20%

[ 08-03-2002, 04:49 PM: Message edited by: ssteelheadsteve ]

[cully]

Well I semi Po'd. The second coat is about 3/4 dry. It's totally weird. One half of the bottom is dry and ready. The half that I put on last. 1/4 (the middle) is just a titch from being dry and the 1/4 that i did first is just gone from tacky to just dry of tacky. I'm not sure who to be po'd at me or bi-mart. Probably me. I did not sand between coats. The second coat is definetly not going to be as smooth as the first coat. It was like glass. Sure I had to make it better and add a second coat :hoboy: A question for anybody staying with me here. If the second coat makes it to completly dry do i dare sand and add a third coat? I disapointed that it's not like glass . It's not far off but could be better. The bottom also pick up air polution on the gluvit as it has been outside in the driveway for 58 hours with this coat. graemlins/1zhelp.gif

[Keta]

With the uneven cure I would say it wasn't completely mixed.

[cully]

sstealheadsteve, what is mkp?

[cully]

Keta, I think your absolutly correct. Shame on me. Seems like me getting things right, means doing something wrong first. There'something strange about that.

[Silver Hilton]

Sound to me like either a mixing problem or a mix ratio problem. I'd try this, before anything else.

Mix a small batch of gluvit, and go 25% strong on the hardener. Paint a small patch of the area that is sticky with this mixture, let it set of for 24 hours, and then test it for hardness, and specifically, whether it adhered well to the previous, sticky layer. The additional hardener may be sufficient to finish the curing of the previous layer.

If this works on the small patch, do the rest of the hull, but do it in two or three shots. You should do this because the additional hardener may reduce the working time of the gluvit. If the batch starts to kick, as in it gets gummier and the pot gets warm to the touch, stop, throw the rest away, and make a new batch to continue with. Try to do the application during cool, dry weather, ideally at about 60 to 65 degree temperature.

Good luck.

[Dan Christopher]

you can not alter the cure rate by changing the mix...

cully
first of i used coat-it not glove -it

i think you got a bad can.
my first can was nice and glass finish the other cans were funny looking in the can and hard to mix up.end product smoth but not glass.i think you need to wait and see if it hardens.dont add more.if it doesnt harden remove and start over. :depressed:

to answer your other question...no i forgot to sand between coats :depressed: it looks good .hope it holds. :rolleyes:

[Silver Hilton]

Mad, you're probably right. The question is whether you can make some additional hardener available to the uncuring coat that he is wrestling with. Since it's a catalytic reaction, Iit seems worth a try, and works in other mediums I have worked with. The approach I described is similar to a trick I try if I get a bad mix on a coat of rod finish, also a two part mixing product in the epoxy family. Might not work, but won't hurt if he tries it on a small part of the boat first, as I recommended.

[cully]

Heard the rain, got up and took a look at the boat. 1/3 of the bang plate is ghostly white. I took a metal scrapper and scraped the ghost ( uncured gluvit) away. I think i got off lucky. With a little more scrapping and sanding I may even make it to the river today. Though it means putting the boat on the trailor. replacing all the decking, gearing up and driving to and fro. Then coming home and flipping the boat over to replace the 1/3 coat i scraped. Now i could just go bank fishing for the day...Naw.....