I mask off where the glue joints will be for the fins, then spray the tube with Rustoleum auto filler primer (gray stuff). I find that pre-spraying the body tube with a lightish coat of filler primer really helps me with this kind of spiral-filling job. I'm in agreement with all of Paul's notes but let me add one more: Works on all types of body tube material ,and thinned down with lacquer thinner and painted on wood ,works great and does not warp like water based stuff. When it`s all good and you are pleased ,sand down with 180 grit (nice and easy) then follow up with 220 and dust off (a TACK CLOTH works best for this after getting the major dust off with a Shop Vac or similar) and prime with a good high solids primer and paint. ![]() The more excess putty you remove now ,the less sanding you do later.Īfter you`re done ,examine the spirals ,you`ll be able to tell or even feel if the spirals are filled ,if not ,repeat the process ***** NO need to sand first ,just re-apply over the same areas **** I then take the spatula and scrape off the excess Putty from both sides of the spiral /seam ,careful not to scrape or touch the area that was filled ,and wipe the spatula blade off on a paper towel (I take a large piece of paper towel and tape it down near the area where I`m filling ,so it only takes one hand to do the job of cleaning the blade) I take the tube ,squeeze out a bit (1/2" long) and use a stainless steel square tip spatula (craft store ,woodworking supply,Mickaels) and work it along the spiral in one motion.It`s like drywall taping and mudding ,DON`T over work it ,do it once and move on. I can easily do a 4" body tube 48" long in 15 minutes and ready for sanding in a half hour ,but of course ,temperature and how thick you apply it will determine this. On deeper spirals ,you may need to apply it a second time ,as it does shrink at bit as the carriers evaporate leaving the Talc behind (yup ,basically just talcum powder in a carrier) ![]() I use Bondo Spot Putty exclusively on spirals and areas that need filling.It dries quickly and sands very easily, although it does smell badly, but the VOCs are what makes it apply easily and dry fast ,so it`s a trade off.I like it.smells like rockets !!
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