help please.....Duratec Sandable Primer for mould surface.

[wind_apparent]

I am almost done with my male mould forms for my Sailpowered hydrofoil project and I want to coat them with Duratec sandable primer as my tool finish. I have never used this stuff before and have a couple of questions: Is this brush or rollable or do I have to shoot it? Are there any issues with humidity (some of these coatings have bonding issues even with low humidity levels). And Do I have to buff it all the way to gloss or would sanding to 400 or 600 do the job? Thanks.

[ondarvr]

I thought I answered this earlier, but it's not here now ??

Brush or roller? sort of, but you would need put on too many coats to make it worth it, you'll sand through trying to get it level. Spraying is the only good method on something that size.

Humidity will slow the cure, but it really shouldn't create a big problem.


You don't need to buff it out, but it sands and buffs fairly easy, so after using 600 grit you should be able to buff out about 95% of the scratches.

[wind_apparent]

Originally Posted by ondarvr

I thought I answered this earlier, but it's not here now ??

Brush or roller? sort of, but you would need on to0 put too many coats to make it worth it, you'll sand through trying get it level. Spraying is the only good method on something that size.

Humidity will slow the cure, but it really shouldn't create a big problem.


You don't need to buff it out, but it sands and buffs fairly easy, so after using 600 grit you should be able to buff out about 95% of the scrathes.

Thanks, looks like I'll take it over to my buddies shop and shoot it, then sand it to 600 and call it good. How many coats is standard?

[ondarvr]

No standard amount, you just need to put on enough coats so you don't sand through the high spots.

[Landlubber]

Keep sanding till the surface is as you require without going through the Duratec, when you do go through, simply respraw and then use a guide coat of say black dust spray, sand that off and the surface is prepared.

[wind_apparent]

Originally Posted by Landlubber

Keep sanding till the surface is as you require without going through the Duratec, when you do go through, simply respraw and then use a guide coat of say black dust spray, sand that off and the surface is prepared.

Can I color the 1st or second coat with something and use that as a guide coat? I don't want to sand through because my painter lives about 45mins away. (I only want to move these things once, the hull tool is 260 pounds and I need to borrow a trailer to do it.) What could I color it with?

[In Theory]

I have used polyester tint (pigment) to modify gray to an almost black for use as a guide during sanding later.

[ondarvr]

For what you need to do almost any type of pigment or gel coat will work to slightly change the color.

[gonzo]

With most things in life, you pay now or you pay later. If you don't buff the molds you will buff the hulls. A mold with a rough surface may cause problems to remove parts.

[ABBOTTCRAFT]

I use Duratec Surfacing Primer on plugs as it produces a harder, glossier finish than sanding primer.. Sanding Primer is OK to buildup a surface but you will find that a final coat of Surfacing Primer will produce a better surface...

[wind_apparent]

Originally Posted by ABBOTTCRAFT

I use Duratec Surfacing Primer on plugs as it produces a harder, glossier finish than sanding primer.. Sanding Primer is OK to buildup a surface but you will find that a final coat of Surfacing Primer will produce a better surface...

I'm talking about Sandable surfaceing primer, is there something different?

[ABBOTTCRAFT]

here's a list of the primers for Hawkeye Industries website.. You will still need to sand the surfacing primer with fine paper & buff, it has the hardest surface of the primers listed below & will withstand more heat...


Sealing, Fairing, Priming and Surfacing Application: Plugs, Patterns and Models


**Duratec Polyester Base Primer (707-051 Tan)

**Duratec Polyester Surfacing Primer (702-003 Black, 707-002 Gray, 714-002 White)

**Duratec Polyester EZ Sanding Primer (702-060 Black, 707-060 Gray, 714-060 White)

[Doug Lord]

Ondarvr, is something like duratec ok on epoxy resin?

[wind_apparent]

Originally Posted by ABBOTTCRAFT

here's a list of the primers for Hawkeye


**Duratec Polyester Surfacing Primer (702-003 Black, 707-002 Gray, 714-002 White)

Yup, that's the one I was going to use.....whats a good sanding schedule for this product? any tricks I should know about? I'm shooting it right onto freshly sanded 6oz glass, do I need a sealer or basecoat or anything?

[ABBOTTCRAFT]

I have used it without a sealer & had no issues..