fiberglass air bubbles

[gerkass]

hey was wondering if any u's can help me.

iv casted a creature in fiberglass in order to pour silicone into the fiberglass mold, but my fiberglass mold has a fair amount of air bubbles in it, not in any major important parts but just in some annoying parts id prefere not to have em in.

i was thinking of using milliputt to cover the airbubbles and try best to make the bubbles look invisible as if there were none before by sculpting the milliputt slightly the best i can to match the lines ect....

my main concern now is will my dragon skin cure properly with the milliput?

and any other ideas on rectifying it wud be handy, , ,other than re sculpting cause running out of time to re sculpt

i think the problem may have been an uneven spread of gelcoat but im unsure, i only recently discovered u can spray gelcoat onto sculpts which wud have been pretty dam handy!!

:wacko

any help be welcome

 

[Darth Lars]

As a general rule, use a filler that is as close to the material that you are trying to fill. If you have a mould made of fiberglass in polyester, then I would recommend a polyester-based filler. I have used something that was called "gelcoat filler" which was fine-grained and smooth.
If your mould was made of fiberglass in epoxy, then I think that Milliput would be ideal because it is an epoxy-based filler.

If I was concerned that two materials would not be compatible, I would try a little bit of both of them together to see what happens.

 

[gerkass]

As a general rule, use a filler that is as close to the material that you are trying to fill. If you have a mould made of fiberglass in polyester, then I would recommend a polyester-based filler. I have used something that was called "gelcoat filler" which was fine-grained and smooth.
If your mould was made of fiberglass in epoxy, then I think that Milliput would be ideal because it is an epoxy-based filler.

If I was concerned that two materials would not be compatible, I would try a little bit of both of them together to see what happens.

cool, thanks, should do the trick then, just wanted to make sure before i started it, , never heard of gellcoat filler. , . .

im wondering how exactly the air bubbles arose,

i have learned a leson though, , use a spray gun to spray the gelcoat instaed of a brush and take my time to put on each layer of fiberglass, , my tutors have told me to be as quick as i could doing it,,,, go to college to learn things and they show you ass ways ha.
but live and learn i guess

 

[SithLord]

Air bubbles come from mixing of the resin and catalyst too quickly. Solvents left on the surface of the mold will degas upon contact with the resin and form bubbles as well.