PC-7 epoxy putty- has anyone tried it?

[LRIPbros]

I was in my local hw store getting some wood filler and happened to see this.
https://www.pcepoxy.com/our-products/paste-epoxies/pc-7.php
I am thinking it would work for fin filets.

 

[rstaff3]

I am pretty sure I've tried that brand. I find hardware store epoxy putties too hard to sand. Maybe you could try mixing in some microballoons. I personally use Superfil. Microballoons are pre-mixed in there.

 

[AfterBurners]

I've always used Fix It Epoxy...seems to work well for me.

 

[Igotnothing]

PC-7 is gritty and will leave a rough surface to fillets, and it is hard to spread evenly - although I have not blasted it with a heat gun while trying to draw a fillet. It probably has some applications, but I think you are better served by a number of other products for fillets. However, if you are going to cover it with tip-to-tip glass or carbon, the gritty surface would probably help with adhesion.

 

[mccordmw]

I'd be a little concerned about the strength.

• Tensile Shear Strength
• ASTM D 1002
• 2150 PSI

• Compressive Yield
• ASTM D 695
• 4245 PSI

• Flexural Strength
• ASTM C 580
• 2920 PSI

• Water Absorption
• ASTM C 413
• 0.44%

• Weight(Specific Gravity)
• ASTM D 792
• 1.16g/cm³ .671oz/in³

• Hardness Shored
• ASTM D 2240
• 76 (1wk)

• Heat Deflection
• ASTM D 648
• 120°F

Now compare that to Rocketpoxy.


Shore “D” hardness 85 ASTM D2240
Tensile strength 7,600 psi ASTM D638
Compression strength 14,800 psi ASTM D695
Typical operating temperature -50°F to 175°F
Maximum use temperature 225°F (107°C)

 

[LRIPbros]

Ok, thanks for the info gents.

 

[Danh]

It works great , you can smooth the fillets out with alcohol and your finger once it starts to setup. I used it on my l1 and l2 rocket have close to 20 flights on it no issues .

That said I now use rocketpoxy .

 

[rharshberger]

It rates below JB Weld with the exception of Hardness, however it is easily accessible.

Here's a link to the TRF thread I did on Common Epoxy comparisons that many TRF'rs use

https://www.rocketryforum.com/showthread.php?138953-Epoxy-Comparisons-and-Technical-Data-Sheets