Sealant for screww holes

Just got me Lowrance Fishfinder 320 (real Bargain) and wondered which is best type of sealant to use for the transducer bracket:roll:

Would I use a normal silicone type sealant as used in bathrooms/window frames or beacause I going to use it inshore should I have a specialist type

Thanks in anticipaation

Warren

i would use the normal stuff myself, and you wont have any problems with water getting into a couple of 3mm holes when the screws are in place they should make a decent seal on there own, make sure they are stainless screws

i would use the normal stuff myself, and you wont have any problems with water getting into a couple of 3mm holes when the screws are in place they should make a decent seal on there own, make sure they are stainless screws

Thks John

the screws are what came with the unit

i would use seikaflex litlle bit more expensive but worth it as john said make sure the screws are stainless steel if the ones with it are not replace them

Thanks Twinkle

Think I will just buy some stainless screws instead using whats with the unit, I was worried on using household type mastic in case it breaks down with salt corrosion

Warren

I been using "all-weather" mastic around the boat for years and never had any problem....you'll get it in any decent builders providers or big hardware. Anyway you'd really only have to be a bit careful if you were screwing through into a void, and where the transducer goes is usually solid.

Generally speaking, any break in the gelcoat on a GRP hull - holes, scrapes, gouges, chips etc - should be sealed over to avoid the possible start of osmosis - where water gets under the gelcoat and into the resin moulding - but thats a very long term thing that takes years to become serious.

tec 7 is one of the best silicone sealant i have come across in years of working in construction

http://www.repairproducts.eu/?gclid=CNK ... 4wodijIO2Q

i used tec 7 on my boat its by far the best sealant out there

I use tec 7 its great and cheaper than sikaflex. also use it in construction. it can seal underwater too it can be used for waste pipes, ponds etc etc so it has lots of uses.

also from the same company tranz 7 which is almost as good but its clear so no mess can be seen.

tec 7 is the dogs boll*x, use it on everything. just be careful when buying it there is a copy called trans 7 its the same colour wrapper but its not half as good in fact its total shite.


bru

Silkaflex or Tec 7 have used both they are good stuff

tec 7 is the dogs boll*x, use it on everything. just be careful when buying it there is a copy called trans 7 its the same colour wrapper but its not half as good in fact its total shite.


bru

I disagree that trans 7 is pure shite as i have used it on alot of stuff in both construction and marine use and find it great. ok maybe its not quite as good as tec 7 but the 'inital grab' is great. alot of guys use it now its about €11 a tube so i dont think people would be spending that kind of money for "shite"

I would not use sealants for filling holes in fibreglass.
It's not that they work, or don't work, or this one is sh** and that one is magic .... it's just that epoxy and fibreglass go together so well other choices seem inappropriate (to me at least), and that's what the boat is already made of.
The fibreglass boat is glass fibre cloth or mat held together by epoxy or polyester adhesive.
So epoxy is the natural, chemically and thermally stable glue and filler to use.
If the boat is upside down, at a "bad" angle or the holes are open so glues will drip/run out before applying the tape, mix in a little talc to thicken the glue, it's almost the same as the industrial thickeners used by the boat makers themselves.
Push in the epoxy glue, tape over with duct tape which the glue can not adhere to, remove tape when hardened, and the glue will have a hard glass smooth surface underneath, as smooth and glossy as the gel coat adjacent to the repair, epoxy is stable if painted over.

tec 7 is the dogs boll*x, use it on everything. just be careful when buying it there is a copy called trans 7 its the same colour wrapper but its not half as good in fact its total shite.


bru

I disagree that trans 7 is pure shite as i have used it on alot of stuff in both construction and marine use and find it great. ok maybe its not quite as good as tec 7 but the 'inital grab' is great. alot of guys use it now its about €11 a tube so i dont think people would be spending that kind of money for "shite"[/quo

na mate is muck
tec 7 rules