Hi Hobbs,
a thick layer of gel coat is not really a good thing because it has no
fiberglass reinforcement. This can cause it to crack at a very slight
knock. The guru's will tell you that the ideal thickness for gel coat is
about 1 to1.5 mm. But in reality, you will find that many GRP parts have
gel coat in excess of that, sometimes up to 4 mm in certain areas. This is
one of the draw backs of brush applied gel coat. But anyway, your repair
should hold fine. Just make sure you catalize the gel coat to cure real
slow otherwise it'll shrink too much and wouldn't bond properly.

Arnold


"Hobbs" wrote in message
...
Another gelcoat / flowcoat question...

How thick can gel coat / flowcoat be applied before it becomes a problem?
I have a bubble at the deck/hull join area where evidently a bubble
existed under the gelcoat.
If I fill it with gelcoat it will be approx 2-3 mm thick. Will this
thickness cause a problem?

Thanks Arnold - I'll give it a go.

One other thing - it's winter here in Australia and the daytime temp is
between 9-15 deg C.
Will the gelcoat properly cure at this low temperature?

"Ystay" wrote in message
...
Hi Hobbs,
a thick layer of gel coat is not really a good thing because it has no
fiberglass reinforcement. This can cause it to crack at a very slight
knock. The guru's will tell you that the ideal thickness for gel coat is
about 1 to1.5 mm. But in reality, you will find that many GRP parts have
gel coat in excess of that, sometimes up to 4 mm in certain areas. This
is one of the draw backs of brush applied gel coat. But anyway, your
repair should hold fine. Just make sure you catalize the gel coat to cure
real slow otherwise it'll shrink too much and wouldn't bond properly.

Arnold


"Hobbs" wrote in message
...
Another gelcoat / flowcoat question...

How thick can gel coat / flowcoat be applied before it becomes a problem?
I have a bubble at the deck/hull join area where evidently a bubble
existed under the gelcoat.
If I fill it with gelcoat it will be approx 2-3 mm thick. Will this
thickness cause a problem?

"Hobbs" wrote in message
...
Thanks Arnold - I'll give it a go.

One other thing - it's winter here in Australia and the daytime temp is
between 9-15 deg C.
Will the gelcoat properly cure at this low temperature?

Hi Hobbs,
no experience in that kind of temperature. But the cure depends a fair bit
on ambient temperature so you may want to catalyse the resin a little more.

Arnold