This may seem like a silly question, but I thought I should ask it anyway. When removing the old sealant, just how critical is it to get it "all" out? What I'm thinking is that it would be close to impossible to get it all out because of it being between the two skins.
So, I guess what I'm asking is............is the goal to get as much out as possible in order to get as much as possible of the new in to seal? I just don't know if the old being in there could do something to lessen the effects of the new.
What we have here to use are: Trempro 625; Acryl-R; and the Creeping Crack Seal. We've used the Trempro before, but not the Acryl-R or Creeping Crack Seal; however, I've heard lots and lots of good things about the Creeping Crack Seal.
This question really came about as I was removing the old sealant. As you can see from the pic, it is some nasty stuff! It feels very hard; plasticy (if that's a word); I tried the 3M wheel on it and it couldn't even budge it. So, I used the CitriStrip on it and then it became a little like elasticized stringyness, would ball up sometimes too.
Is this typical for how the seams on vintage trailers look (as in our picture) -- the black gunk on the outside of the seams? It almost looks like asphalt or black jack.
So, my plan, unless someone tells me it's wrong, is to remove as much as possible (knowing that there's probably some more in there between the seams somewhere), finish polishing, then new sealant and lastly the Creeping Crack Seal.
Thanks everyone; just trying to get it right the first time -- I really don't want to mess up the new subfloor due to a leak because I missed a step or two.