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  Topic Review (Newest First)
10-08-2007 01:06 PM
sailingdog saurav-

There is no real way to estimate the drying time, without knowing a lot more information as RTD has pointed out.

The other question is how much of the existing core has rotted or delaminated?
10-08-2007 01:01 PM
RAGTIMEDON Drying time depends upon ambient humidity, temperature, and air flow. Consequently there is no answer to "How much time will be required to dry it?" Your wife probably has a clothes dryer in the laundry room. Notice that it uses heat (either gas or electricity} an forced air flow (a fan and a vent.) Same thing works for drying that wet deck. It will dry a lot faster if you can force air in or suck air out of the holes you drill in the deck, and apply a heat source such as an infrared lamp, hair dryer, radiant heat room heater, or some such. But if the relative humidity where your are working is high, that will slow it. After the area appears to be completely dry, give it another 20percent excess treatment. I know that is not the answer you wanted, but it's the facts!
10-08-2007 12:22 PM
saurav16 SD,

So if I drill holes in the area 1.5 inches apart or whatever is specified in the Don Casey book. I take out the damaged material with allen wrench on the drill or bent nail and vaccum it out, then I can dry it with alcohol. But the question is how much time will be required to dry it do you think?
10-08-2007 12:05 PM
sailingdog The real problem is that it is very hard to accellerate drying out the core material. Even using Acetone or Alcohol isn't going to help unless the acetone/alcohol can get to the soaked areas... and unless you're planningon drilling lots of holes, you'll still have areas of core that is still damp/wet even after quite some time. Doing it properly, using heat and vacuum will help get rid of the deeper moisture, but still requires time.
10-08-2007 11:43 AM
saurav16 What is considered a small enough area to use this or the alcohol approach with? Also anyone done anything else to dry core material with out removing the core? Thanks!
10-07-2007 11:21 PM
twcook I tried it briefly with an area of damp plywood before deciding that the better plan was just to remove and replace the wood involved. It did rapidly make an obvious difference in the dampness, and dried rather quickly, but the fumes remained for a while despite having arranged careful ventilation so I went on to plan B.
10-07-2007 10:10 PM
sailingdog BTW, the acetone is rather dangerous, being quite flammable... so if you're going to try this route... be very careful to ventilate the area well. I would think that alcohol would be safer than acetone, as it is far less agressive and far less likely to attack the fiberglass.
10-07-2007 09:51 PM
NOLAsailing The theory is that the acetone displaces the water and then rapidly evaporates, leaving the area dry and clean. What Don Casey is describing is using the acetone to dry the area after reaming out the wet core via the "drill and fill" method. Mr. Casey's book aside, this job abides no short cuts. If it's a small area, by all means use acetone before injecting thickened epoxy - but you HAVE to remove all of the wet core first and acetone won't do that by itself. Tenting a heat lamp can also work.

If it's a larger area, remove the skin, recore and reglass.
10-07-2007 09:34 PM
saurav16 well acetone evaporates really quickly so it would dry hopefully before damaging the glass or epoxy.
10-07-2007 09:21 PM
Sailormann Never tried it or seen it done. I would be a bit nervous about trying it, as the acetone breaks down the resins in the fibreglass. I imagine that when it mixes with the water it stabilises and is no longer antagonistic, but I would worry that not all of the acetone got mixed with water and that it was in there slowly weakening the glass...the denatured alcohol sounds like a better bet...
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