This is being discussed in the "what did you do today in rocketry?" Several are proponents of the 3M Patch with primer product.
Here goesI use and Highly recommend GoodFila CWF. Creamy smooth, easy to sand, dries fast. I cover the whole tube. I put on nitrile gloves scoop some up and rub it up and down the BT. Let it dry a couple of hours and sand it off. I start with 120, then 220 then 400. You can thin it easily. You can paint it on small blemishes. I use it on balsa and plywood. I used to use Elmer's CWF. Not anymore. No Bondo either. Too toxic.
6 fins, my kind of rocketHere goes
You'll probably like this then too6 fins, my kind of rocket
I like that a lot.You'll probably like this then too
I've been using a tub of older Elmer's Carpenter's Wood Filler for years now on everything including L2 HP rockets and never had any issue. You'd have paint issues before filler issues (unless your spirals are more like cracks lol).I used the filler below for filling spirals on LPR kits, but would it stand up to HPR?
If not, any suggestions for filling spirals on a 4" Super DX3?
View attachment 541502
How is it to sand?3M, spreads a lot easier than wood filler, and it's some really tough stuff
I use and Highly recommend GoodFila CWF. Creamy smooth, easy to sand, dries fast. I cover the whole tube. I put on nitrile gloves scoop some up and rub it up and down the BT. Let it dry a couple of hours and sand it off. I start with 120, then 220 then 400. You can thin it easily. You can paint it on small blemishes. I use it on balsa and plywood. I used to use Elmer's CWF. Not anymore. No Bondo either. Too toxic.
With some of the other fillers I have to use 400 Grit as they simply disappear quickly making it necessary to apply a second coat, but this stuff requires either 220 or 320 to knock it down, but it's like cement when you get done.How is it to sand?
It will easily stand up to high power if you fiberglass over it. You don't need much, one or two layers of 2 oz cloth and a layer of 0.75 oz cloth. This will also give a nice surface to prime and paint.I used the filler below for filling spirals on LPR kits, but would it stand up to HPR?
If not, any suggestions for filling spirals on a 4" Super DX3?
View attachment 541502
Does anyone have any specific advice for filling the spirals in Blue Tube? The spiral grooves are HUGE. I have been honestly considering wrapping these 6" dia tubes with a layer of 2 oz glass instead of dealing with that much filling and sanding.
The thick stuff. It's an off white color. Water based grain and wood filler. I first bought it in 8 oz jars. Now I buy it by the quart.So the clear stuff? I have used the thick stuff but not the clear.
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