John wrote:
I have a number of leaks at joints that I have tried to fix but
there is so much old sealant already there that applying more
just doesn't work.
A wire brush drill attachment:
http://images50.fotki.com/v1559/phot...eDIY046-vi.jpg
Or maybe a smaller one for a Dremel tool (if you have one).
Other than a sharp putty knife, you might want to try gasoline or laquer
thinner.
I have my doubts about the heat-gun. You might also look at a plumbers
torch.
I really don't know how these silicone or latex sealants react to
extreme heat.