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Building Tips and technical articles. => Paint and finishing => Topic started by: Charles Meeks on September 01, 2017, 01:07:42 AM

Title: Will butyrate and silkspan warp 3/16 parts?
Post by: Charles Meeks on September 01, 2017, 01:07:42 AM
I do not have very much experience with dope yet.  I am new to the hobby and crashing is my best stunt.  Working on a somewhat Fancherized Twister/ Allen Brickhaus Scimitar and want to cover the twin rudders with silkspan.  They are 3/16 medium balsa cut on a 45 degree grain.  I have butyrate dope and I also have Minwax polycrylic.  Or I could just use dope and forget covering it.  I am planning on covering the fuse and stab/elevator with silkspan and dope and polyspan on the wings. 
I appreciate your help.
Best Regards,
Charles
Title: Re: Will butyrate and silkspan warp 3/16 parts?
Post by: Don Jenkins on September 01, 2017, 05:31:39 AM
Yes, it could warp, and most likely will.  Use non-tautening dope with silk-span on wood surfaces and warpage should not be a problem.  Aircraft Spruce has Randolph dope in non-tautening Nitrate and Butyrate.  Although there dope is not the least bit fuel proof based on my horrifying experience!   

Don
Title: Re: Will butyrate and silkspan warp 3/16 parts?
Post by: john e. holliday on September 01, 2017, 02:05:15 PM
I use thinned Butyrate dope and silk span/poly-span on 1/8 balsa covered both sides.   You need to go light with the first coats of dope on rudders, stabs and elevators  Do one side then the other almost immediately.  Once you get enough dope on, like three coats lightly sand the roughness.  I you go to heavy on one side they will warp but it can be remove with more coats on other side.  It takes practice. H^^