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Misc
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Joined: 15 Aug 2005
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PostPosted: 19:34 - 11 Jan 2010    Post subject: Fiberglass/MDF people Reply with quote
Evening all,

I'm going to be making a fiberglass subwoofer enclosure which the base will be fiberglass & the lid will be 18mm MDF. It's a round shape so using acoustic carpet is out of the question so i want to use a nice gloss black spray but i know the MDF will just soak up the paint so i've been reading online & someone said to seal the MDF with some PVA then prime it with high build primer.
The thing is that i can't see any type of paint being able to 'grab' something like PVA as it's going to be super smooth. Would it work?

The other is the fiberglass, can i just prime it without any sealant or filler?

Cheers.
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Sparks!
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Joined: 30 Aug 2003
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PostPosted: 19:38 - 11 Jan 2010    Post subject: Reply with quote
Seal it with PVA glue or proper MDF sealer (which is essentially PVA glue ready mixed and ten times the price) .. you'd get a good finish with good paint and lots of sanding.

BUT you'll never get it as good as a fibreglassed finish.
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Misc
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PostPosted: 19:44 - 11 Jan 2010    Post subject: Reply with quote
Sparks! wrote:
Seal it with PVA glue or proper MDF sealer (which is essentially PVA glue ready mixed and ten times the price) .. you'd get a good finish with good paint and lots of sanding.

BUT you'll never get it as good as a fibreglassed finish.


Cheers mate.

After i've sealed it, does the PVA need any sanding to get the primer to hold?

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Sparks!
Sir Tart-a-lot



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PostPosted: 22:03 - 11 Jan 2010    Post subject: Reply with quote
Misc wrote:
Sparks! wrote:
Seal it with PVA glue or proper MDF sealer (which is essentially PVA glue ready mixed and ten times the price) .. you'd get a good finish with good paint and lots of sanding.

BUT you'll never get it as good as a fibreglassed finish.


Cheers mate.

After i've sealed it, does the PVA need any sanding to get the primer to hold?

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It doesn't need sanding for the paint/primer to hold no.. but you'll probably want to do some sanding for smoothness... I would definetly suggest to primer it though, the last MDF I painted I didn't primer and it painted really well, but you'll always get a better job with primer.
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Misc
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PostPosted: 22:14 - 11 Jan 2010    Post subject: Reply with quote
Ok, brilliant. Thanks a lot. Thumbs Up
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Sparks!
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PostPosted: 22:31 - 11 Jan 2010    Post subject: Reply with quote
Misc wrote:
Ok, brilliant. Thanks a lot. Thumbs Up


No probs.. worth getting some wet and dry paper for in between coats and for the final finish. And invest in some decent paint if you're really after a good finish.. I normally use cheap B&Q own type paint but for a room I'm doing at home at the minute I decided to use Dulux and have to say it is worth the money as it painted easy and looks really good and seems to paint a lot more "deep" and even, compared to cheaper paints.

You *might* be able to lacquer over it too, or clear varnish, not entirely sure on this one, but I think it'd provide a smoother glossier finish, but I've never done this so you might need to test it or get some confirmation on whats best to do...
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Misc
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PostPosted: 00:51 - 12 Jan 2010    Post subject: Reply with quote
Sparks! wrote:
Misc wrote:
Ok, brilliant. Thanks a lot. Thumbs Up


No probs.. worth getting some wet and dry paper for in between coats and for the final finish. And invest in some decent paint if you're really after a good finish.. I normally use cheap B&Q own type paint but for a room I'm doing at home at the minute I decided to use Dulux and have to say it is worth the money as it painted easy and looks really good and seems to paint a lot more "deep" and even, compared to cheaper paints.

You *might* be able to lacquer over it too, or clear varnish, not entirely sure on this one, but I think it'd provide a smoother glossier finish, but I've never done this so you might need to test it or get some confirmation on whats best to do...



I'm going to be using spray paint to get that smooth even finish & i'm thinking of getting those graffiti spray paints 'montana' as there meant to give a great finish, be easy to work with & meant to be quite hard to get them to drip/run. Should be better then the Plastikote stuff the DIY stores sell anyway.

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